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mariadb/sql/sql_partition.cc
Alexander Barkov aacb4d57ca MDEV-12695 Add Column_definition::type_handler()
2017-05-05 07:00:18 +04:00

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/* Copyright (c) 2005, 2014, Oracle and/or its affiliates.
Copyright (c) 2009, 2014, SkySQL Ab.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */
/*
This file is a container for general functionality related
to partitioning introduced in MySQL version 5.1. It contains functionality
used by all handlers that support partitioning, such as
the partitioning handler itself and the NDB handler.
(Much of the code in this file has been split into partition_info.cc and
the header files partition_info.h + partition_element.h + sql_partition.h)
The first version was written by Mikael Ronstrom 2004-2006.
Various parts of the optimizer code was written by Sergey Petrunia.
Code have been maintained by Mattias Jonsson.
The second version was written by Mikael Ronstrom 2006-2007 with some
final fixes for partition pruning in 2008-2009 with assistance from Sergey
Petrunia and Mattias Jonsson.
The first version supports RANGE partitioning, LIST partitioning, HASH
partitioning and composite partitioning (hereafter called subpartitioning)
where each RANGE/LIST partitioning is HASH partitioned. The hash function
can either be supplied by the user or by only a list of fields (also
called KEY partitioning), where the MySQL server will use an internal
hash function.
There are quite a few defaults that can be used as well.
The second version introduces a new variant of RANGE and LIST partitioning
which is often referred to as column lists in the code variables. This
enables a user to specify a set of columns and their concatenated value
as the partition value. By comparing the concatenation of these values
the proper partition can be choosen.
*/
/* Some general useful functions */
#define MYSQL_LEX 1
#include <my_global.h>
#include "sql_priv.h"
#include "sql_partition.h"
#include "key.h" // key_restore
#include "sql_parse.h" // parse_sql
#include "sql_cache.h" // query_cache_invalidate3
#include "lock.h" // mysql_lock_remove
#include "sql_show.h" // append_identifier
#include <m_ctype.h>
#include "transaction.h"
#include "debug_sync.h"
#include "sql_base.h" // close_all_tables_for_name
#include "sql_table.h" // build_table_filename,
// build_table_shadow_filename,
// table_to_filename
// mysql_*_alter_copy_data
#include "opt_range.h" // store_key_image_to_rec
#include "sql_alter.h" // Alter_table_ctx
#include "sql_select.h"
#include <algorithm>
using std::max;
using std::min;
#ifdef WITH_PARTITION_STORAGE_ENGINE
#include "ha_partition.h"
#define ERROR_INJECT_CRASH(code) \
DBUG_EVALUATE_IF(code, (DBUG_SUICIDE(), 0), 0)
#define ERROR_INJECT_ERROR(code) \
DBUG_EVALUATE_IF(code, (my_error(ER_UNKNOWN_ERROR, MYF(0)), TRUE), 0)
/*
Partition related functions declarations and some static constants;
*/
const LEX_STRING partition_keywords[]=
{
{ C_STRING_WITH_LEN("HASH") },
{ C_STRING_WITH_LEN("RANGE") },
{ C_STRING_WITH_LEN("LIST") },
{ C_STRING_WITH_LEN("KEY") },
{ C_STRING_WITH_LEN("MAXVALUE") },
{ C_STRING_WITH_LEN("LINEAR ") },
{ C_STRING_WITH_LEN(" COLUMNS") },
{ C_STRING_WITH_LEN("ALGORITHM") }
};
static const char *part_str= "PARTITION";
static const char *sub_str= "SUB";
static const char *by_str= "BY";
static const char *space_str= " ";
static const char *equal_str= "=";
static const char *end_paren_str= ")";
static const char *begin_paren_str= "(";
static const char *comma_str= ",";
static int get_partition_id_list_col(partition_info *, uint32 *, longlong *);
static int get_partition_id_list(partition_info *, uint32 *, longlong *);
static int get_partition_id_range_col(partition_info *, uint32 *, longlong *);
static int get_partition_id_range(partition_info *, uint32 *, longlong *);
static int get_part_id_charset_func_part(partition_info *, uint32 *, longlong *);
static int get_part_id_charset_func_subpart(partition_info *, uint32 *);
static int get_partition_id_hash_nosub(partition_info *, uint32 *, longlong *);
static int get_partition_id_key_nosub(partition_info *, uint32 *, longlong *);
static int get_partition_id_linear_hash_nosub(partition_info *, uint32 *, longlong *);
static int get_partition_id_linear_key_nosub(partition_info *, uint32 *, longlong *);
static int get_partition_id_with_sub(partition_info *, uint32 *, longlong *);
static int get_partition_id_hash_sub(partition_info *part_info, uint32 *part_id);
static int get_partition_id_key_sub(partition_info *part_info, uint32 *part_id);
static int get_partition_id_linear_hash_sub(partition_info *part_info, uint32 *part_id);
static int get_partition_id_linear_key_sub(partition_info *part_info, uint32 *part_id);
static uint32 get_next_partition_via_walking(PARTITION_ITERATOR*);
static void set_up_range_analysis_info(partition_info *part_info);
static uint32 get_next_subpartition_via_walking(PARTITION_ITERATOR*);
#endif
uint32 get_next_partition_id_range(PARTITION_ITERATOR* part_iter);
uint32 get_next_partition_id_list(PARTITION_ITERATOR* part_iter);
int get_part_iter_for_interval_via_mapping(partition_info *part_info,
bool is_subpart,
uint32 *store_length_array,
uchar *min_value, uchar *max_value,
uint min_len, uint max_len,
uint flags,
PARTITION_ITERATOR *part_iter);
int get_part_iter_for_interval_cols_via_map(partition_info *part_info,
bool is_subpart,
uint32 *store_length_array,
uchar *min_value, uchar *max_value,
uint min_len, uint max_len,
uint flags,
PARTITION_ITERATOR *part_iter);
int get_part_iter_for_interval_via_walking(partition_info *part_info,
bool is_subpart,
uint32 *store_length_array,
uchar *min_value, uchar *max_value,
uint min_len, uint max_len,
uint flags,
PARTITION_ITERATOR *part_iter);
#ifdef WITH_PARTITION_STORAGE_ENGINE
static int cmp_rec_and_tuple(part_column_list_val *val, uint32 nvals_in_rec);
static int cmp_rec_and_tuple_prune(part_column_list_val *val,
uint32 n_vals_in_rec,
bool is_left_endpoint,
bool include_endpoint);
/*
Convert constants in VALUES definition to the character set the
corresponding field uses.
SYNOPSIS
convert_charset_partition_constant()
item Item to convert
cs Character set to convert to
RETURN VALUE
NULL Error
item New converted item
*/
Item* convert_charset_partition_constant(Item *item, CHARSET_INFO *cs)
{
THD *thd= current_thd;
Name_resolution_context *context= &thd->lex->current_select->context;
TABLE_LIST *save_list= context->table_list;
const char *save_where= thd->where;
item= item->safe_charset_converter(thd, cs);
context->table_list= NULL;
thd->where= "convert character set partition constant";
if (!item || item->fix_fields(thd, (Item**)NULL))
item= NULL;
thd->where= save_where;
context->table_list= save_list;
return item;
}
/**
A support function to check if a name is in a list of strings.
@param name String searched for
@param list_names A list of names searched in
@return True if if the name is in the list.
@retval true String found
@retval false String not found
*/
static bool is_name_in_list(const char *name, List<const char> list_names)
{
List_iterator<const char> names_it(list_names);
uint num_names= list_names.elements;
uint i= 0;
do
{
const char *list_name= names_it++;
if (!(my_strcasecmp(system_charset_info, name, list_name)))
return TRUE;
} while (++i < num_names);
return FALSE;
}
/*
Set-up defaults for partitions.
SYNOPSIS
partition_default_handling()
table Table object
part_info Partition info to set up
is_create_table_ind Is this part of a table creation
normalized_path Normalized path name of table and database
RETURN VALUES
TRUE Error
FALSE Success
*/
bool partition_default_handling(THD *thd, TABLE *table, partition_info *part_info,
bool is_create_table_ind,
const char *normalized_path)
{
DBUG_ENTER("partition_default_handling");
if (!is_create_table_ind)
{
if (part_info->use_default_num_partitions)
{
if (table->file->get_no_parts(normalized_path, &part_info->num_parts))
{
DBUG_RETURN(TRUE);
}
}
else if (part_info->is_sub_partitioned() &&
part_info->use_default_num_subpartitions)
{
uint num_parts;
if (table->file->get_no_parts(normalized_path, &num_parts))
{
DBUG_RETURN(TRUE);
}
DBUG_ASSERT(part_info->num_parts > 0);
DBUG_ASSERT((num_parts % part_info->num_parts) == 0);
part_info->num_subparts= num_parts / part_info->num_parts;
}
}
part_info->set_up_defaults_for_partitioning(thd, table->file,
NULL, 0U);
DBUG_RETURN(FALSE);
}
/*
A useful routine used by update_row for partition handlers to calculate
the partition ids of the old and the new record.
SYNOPSIS
get_part_for_update()
old_data Buffer of old record
new_data Buffer of new record
rec0 Reference to table->record[0]
part_info Reference to partition information
out:old_part_id The returned partition id of old record
out:new_part_id The returned partition id of new record
RETURN VALUE
0 Success
> 0 Error code
*/
int get_parts_for_update(const uchar *old_data, const uchar *new_data,
const uchar *rec0, partition_info *part_info,
uint32 *old_part_id, uint32 *new_part_id,
longlong *new_func_value)
{
Field **part_field_array= part_info->full_part_field_array;
int error;
longlong old_func_value;
DBUG_ENTER("get_parts_for_update");
DBUG_ASSERT(new_data == rec0); // table->record[0]
part_info->table->move_fields(part_field_array, old_data, rec0);
error= part_info->get_partition_id(part_info, old_part_id,
&old_func_value);
part_info->table->move_fields(part_field_array, rec0, old_data);
if (unlikely(error)) // Should never happen
{
DBUG_ASSERT(0);
DBUG_RETURN(error);
}
#ifdef NOT_NEEDED
if (new_data == rec0)
#endif
{
if (unlikely(error= part_info->get_partition_id(part_info,
new_part_id,
new_func_value)))
{
DBUG_RETURN(error);
}
}
#ifdef NOT_NEEDED
else
{
/*
This branch should never execute but it is written anyways for
future use. It will be tested by ensuring that the above
condition is false in one test situation before pushing the code.
*/
part_info->table->move_fields(part_field_array, new_data, rec0);
error= part_info->get_partition_id(part_info, new_part_id,
new_func_value);
part_info->table->move_fields(part_field_array, rec0, new_data);
if (unlikely(error))
{
DBUG_RETURN(error);
}
}
#endif
DBUG_RETURN(0);
}
/*
A useful routine used by delete_row for partition handlers to calculate
the partition id.
SYNOPSIS
get_part_for_delete()
buf Buffer of old record
rec0 Reference to table->record[0]
part_info Reference to partition information
out:part_id The returned partition id to delete from
RETURN VALUE
0 Success
> 0 Error code
DESCRIPTION
Dependent on whether buf is not record[0] we need to prepare the
fields. Then we call the function pointer get_partition_id to
calculate the partition id.
*/
int get_part_for_delete(const uchar *buf, const uchar *rec0,
partition_info *part_info, uint32 *part_id)
{
int error;
longlong func_value;
DBUG_ENTER("get_part_for_delete");
if (likely(buf == rec0))
{
if (unlikely((error= part_info->get_partition_id(part_info, part_id,
&func_value))))
{
DBUG_RETURN(error);
}
DBUG_PRINT("info", ("Delete from partition %d", *part_id));
}
else
{
Field **part_field_array= part_info->full_part_field_array;
part_info->table->move_fields(part_field_array, buf, rec0);
error= part_info->get_partition_id(part_info, part_id, &func_value);
part_info->table->move_fields(part_field_array, rec0, buf);
if (unlikely(error))
{
DBUG_RETURN(error);
}
DBUG_PRINT("info", ("Delete from partition %d (path2)", *part_id));
}
DBUG_RETURN(0);
}
/*
This method is used to set-up both partition and subpartitioning
field array and used for all types of partitioning.
It is part of the logic around fix_partition_func.
SYNOPSIS
set_up_field_array()
table TABLE object for which partition fields are set-up
sub_part Is the table subpartitioned as well
RETURN VALUE
TRUE Error, some field didn't meet requirements
FALSE Ok, partition field array set-up
DESCRIPTION
A great number of functions below here is part of the fix_partition_func
method. It is used to set up the partition structures for execution from
openfrm. It is called at the end of the openfrm when the table struct has
been set-up apart from the partition information.
It involves:
1) Setting arrays of fields for the partition functions.
2) Setting up binary search array for LIST partitioning
3) Setting up array for binary search for RANGE partitioning
4) Setting up key_map's to assist in quick evaluation whether one
can deduce anything from a given index of what partition to use
5) Checking whether a set of partitions can be derived from a range on
a field in the partition function.
As part of doing this there is also a great number of error controls.
This is actually the place where most of the things are checked for
partition information when creating a table.
Things that are checked includes
1) All fields of partition function in Primary keys and unique indexes
(if not supported)
Create an array of partition fields (NULL terminated). Before this method
is called fix_fields or find_table_in_sef has been called to set
GET_FIXED_FIELDS_FLAG on all fields that are part of the partition
function.
*/
static bool set_up_field_array(THD *thd, TABLE *table,
bool is_sub_part)
{
Field **ptr, *field, **field_array;
uint num_fields= 0;
uint size_field_array;
uint i= 0;
uint inx;
partition_info *part_info= table->part_info;
int result= FALSE;
DBUG_ENTER("set_up_field_array");
ptr= table->field;
while ((field= *(ptr++)))
{
if (field->flags & GET_FIXED_FIELDS_FLAG)
num_fields++;
}
if (num_fields > MAX_REF_PARTS)
{
char *err_str;
if (is_sub_part)
err_str= (char*)"subpartition function";
else
err_str= (char*)"partition function";
my_error(ER_TOO_MANY_PARTITION_FUNC_FIELDS_ERROR, MYF(0), err_str);
DBUG_RETURN(TRUE);
}
if (num_fields == 0)
{
/*
We are using hidden key as partitioning field
*/
DBUG_ASSERT(!is_sub_part);
DBUG_RETURN(result);
}
size_field_array= (num_fields+1)*sizeof(Field*);
field_array= (Field**) thd->calloc(size_field_array);
if (unlikely(!field_array))
{
mem_alloc_error(size_field_array);
result= TRUE;
}
ptr= table->field;
while ((field= *(ptr++)))
{
if (field->flags & GET_FIXED_FIELDS_FLAG)
{
field->flags&= ~GET_FIXED_FIELDS_FLAG;
field->flags|= FIELD_IN_PART_FUNC_FLAG;
if (likely(!result))
{
if (!is_sub_part && part_info->column_list)
{
List_iterator<const char> it(part_info->part_field_list);
const char *field_name;
DBUG_ASSERT(num_fields == part_info->part_field_list.elements);
inx= 0;
do
{
field_name= it++;
if (!my_strcasecmp(system_charset_info,
field_name,
field->field_name.str))
break;
} while (++inx < num_fields);
if (inx == num_fields)
{
/*
Should not occur since it should already been checked in either
add_column_list_values, handle_list_of_fields,
check_partition_info etc.
*/
DBUG_ASSERT(0);
my_error(ER_FIELD_NOT_FOUND_PART_ERROR, MYF(0));
result= TRUE;
continue;
}
}
else
inx= i;
field_array[inx]= field;
i++;
/*
We check that the fields are proper. It is required for each
field in a partition function to:
1) Not be a BLOB of any type
A BLOB takes too long time to evaluate so we don't want it for
performance reasons.
*/
if (unlikely(field->flags & BLOB_FLAG))
{
my_error(ER_BLOB_FIELD_IN_PART_FUNC_ERROR, MYF(0));
result= TRUE;
}
}
}
}
field_array[num_fields]= 0;
if (!is_sub_part)
{
part_info->part_field_array= field_array;
part_info->num_part_fields= num_fields;
}
else
{
part_info->subpart_field_array= field_array;
part_info->num_subpart_fields= num_fields;
}
DBUG_RETURN(result);
}
/*
Create a field array including all fields of both the partitioning and the
subpartitioning functions.
SYNOPSIS
create_full_part_field_array()
thd Thread handle
table TABLE object for which partition fields are set-up
part_info Reference to partitioning data structure
RETURN VALUE
TRUE Memory allocation of field array failed
FALSE Ok
DESCRIPTION
If there is no subpartitioning then the same array is used as for the
partitioning. Otherwise a new array is built up using the flag
FIELD_IN_PART_FUNC in the field object.
This function is called from fix_partition_func
*/
static bool create_full_part_field_array(THD *thd, TABLE *table,
partition_info *part_info)
{
bool result= FALSE;
Field **ptr;
my_bitmap_map *bitmap_buf;
DBUG_ENTER("create_full_part_field_array");
if (!part_info->is_sub_partitioned())
{
part_info->full_part_field_array= part_info->part_field_array;
part_info->num_full_part_fields= part_info->num_part_fields;
}
else
{
Field *field, **field_array;
uint num_part_fields=0, size_field_array;
ptr= table->field;
while ((field= *(ptr++)))
{
if (field->flags & FIELD_IN_PART_FUNC_FLAG)
num_part_fields++;
}
size_field_array= (num_part_fields+1)*sizeof(Field*);
field_array= (Field**) thd->calloc(size_field_array);
if (unlikely(!field_array))
{
mem_alloc_error(size_field_array);
result= TRUE;
goto end;
}
num_part_fields= 0;
ptr= table->field;
while ((field= *(ptr++)))
{
if (field->flags & FIELD_IN_PART_FUNC_FLAG)
field_array[num_part_fields++]= field;
}
field_array[num_part_fields]=0;
part_info->full_part_field_array= field_array;
part_info->num_full_part_fields= num_part_fields;
}
/*
Initialize the set of all fields used in partition and subpartition
expression. Required for testing of partition fields in write_set
when updating. We need to set all bits in read_set because the row
may need to be inserted in a different [sub]partition.
*/
if (!(bitmap_buf= (my_bitmap_map*)
thd->alloc(bitmap_buffer_size(table->s->fields))))
{
mem_alloc_error(bitmap_buffer_size(table->s->fields));
result= TRUE;
goto end;
}
if (my_bitmap_init(&part_info->full_part_field_set, bitmap_buf,
table->s->fields, FALSE))
{
mem_alloc_error(table->s->fields);
result= TRUE;
goto end;
}
/*
full_part_field_array may be NULL if storage engine supports native
partitioning.
*/
if ((ptr= part_info->full_part_field_array))
for (; *ptr; ptr++)
bitmap_set_bit(&part_info->full_part_field_set, (*ptr)->field_index);
end:
DBUG_RETURN(result);
}
/*
Clear flag GET_FIXED_FIELDS_FLAG in all fields of a key previously set by
set_indicator_in_key_fields (always used in pairs).
SYNOPSIS
clear_indicator_in_key_fields()
key_info Reference to find the key fields
RETURN VALUE
NONE
DESCRIPTION
These support routines is used to set/reset an indicator of all fields
in a certain key. It is used in conjunction with another support routine
that traverse all fields in the PF to find if all or some fields in the
PF is part of the key. This is used to check primary keys and unique
keys involve all fields in PF (unless supported) and to derive the
key_map's used to quickly decide whether the index can be used to
derive which partitions are needed to scan.
*/
static void clear_indicator_in_key_fields(KEY *key_info)
{
KEY_PART_INFO *key_part;
uint key_parts= key_info->user_defined_key_parts, i;
for (i= 0, key_part=key_info->key_part; i < key_parts; i++, key_part++)
key_part->field->flags&= (~GET_FIXED_FIELDS_FLAG);
}
/*
Set flag GET_FIXED_FIELDS_FLAG in all fields of a key.
SYNOPSIS
set_indicator_in_key_fields
key_info Reference to find the key fields
RETURN VALUE
NONE
*/
static void set_indicator_in_key_fields(KEY *key_info)
{
KEY_PART_INFO *key_part;
uint key_parts= key_info->user_defined_key_parts, i;
for (i= 0, key_part=key_info->key_part; i < key_parts; i++, key_part++)
key_part->field->flags|= GET_FIXED_FIELDS_FLAG;
}
/*
Check if all or some fields in partition field array is part of a key
previously used to tag key fields.
SYNOPSIS
check_fields_in_PF()
ptr Partition field array
out:all_fields Is all fields of partition field array used in key
out:some_fields Is some fields of partition field array used in key
RETURN VALUE
all_fields, some_fields
*/
static void check_fields_in_PF(Field **ptr, bool *all_fields,
bool *some_fields)
{
DBUG_ENTER("check_fields_in_PF");
*all_fields= TRUE;
*some_fields= FALSE;
if ((!ptr) || !(*ptr))
{
*all_fields= FALSE;
DBUG_VOID_RETURN;
}
do
{
/* Check if the field of the PF is part of the current key investigated */
if ((*ptr)->flags & GET_FIXED_FIELDS_FLAG)
*some_fields= TRUE;
else
*all_fields= FALSE;
} while (*(++ptr));
DBUG_VOID_RETURN;
}
/*
Clear flag GET_FIXED_FIELDS_FLAG in all fields of the table.
This routine is used for error handling purposes.
SYNOPSIS
clear_field_flag()
table TABLE object for which partition fields are set-up
RETURN VALUE
NONE
*/
static void clear_field_flag(TABLE *table)
{
Field **ptr;
DBUG_ENTER("clear_field_flag");
for (ptr= table->field; *ptr; ptr++)
(*ptr)->flags&= (~GET_FIXED_FIELDS_FLAG);
DBUG_VOID_RETURN;
}
/*
find_field_in_table_sef finds the field given its name. All fields get
GET_FIXED_FIELDS_FLAG set.
SYNOPSIS
handle_list_of_fields()
it A list of field names for the partition function
table TABLE object for which partition fields are set-up
part_info Reference to partitioning data structure
sub_part Is the table subpartitioned as well
RETURN VALUE
TRUE Fields in list of fields not part of table
FALSE All fields ok and array created
DESCRIPTION
This routine sets-up the partition field array for KEY partitioning, it
also verifies that all fields in the list of fields is actually a part of
the table.
*/
static bool handle_list_of_fields(THD *thd, List_iterator<const char> it,
TABLE *table,
partition_info *part_info,
bool is_sub_part)
{
Field *field;
bool result;
const char *field_name;
bool is_list_empty= TRUE;
DBUG_ENTER("handle_list_of_fields");
while ((field_name= it++))
{
is_list_empty= FALSE;
field= find_field_in_table_sef(table, field_name);
if (likely(field != 0))
field->flags|= GET_FIXED_FIELDS_FLAG;
else
{
my_error(ER_FIELD_NOT_FOUND_PART_ERROR, MYF(0));
clear_field_flag(table);
result= TRUE;
goto end;
}
}
if (is_list_empty && part_info->part_type == HASH_PARTITION)
{
uint primary_key= table->s->primary_key;
if (primary_key != MAX_KEY)
{
uint num_key_parts= table->key_info[primary_key].user_defined_key_parts, i;
/*
In the case of an empty list we use primary key as partition key.
*/
for (i= 0; i < num_key_parts; i++)
{
Field *field= table->key_info[primary_key].key_part[i].field;
field->flags|= GET_FIXED_FIELDS_FLAG;
}
}
else
{
if (table->s->db_type()->partition_flags &&
(table->s->db_type()->partition_flags() & HA_USE_AUTO_PARTITION) &&
(table->s->db_type()->partition_flags() & HA_CAN_PARTITION))
{
/*
This engine can handle automatic partitioning and there is no
primary key. In this case we rely on that the engine handles
partitioning based on a hidden key. Thus we allocate no
array for partitioning fields.
*/
DBUG_RETURN(FALSE);
}
else
{
my_error(ER_FIELD_NOT_FOUND_PART_ERROR, MYF(0));
DBUG_RETURN(TRUE);
}
}
}
result= set_up_field_array(thd, table, is_sub_part);
end:
DBUG_RETURN(result);
}
/*
Support function to check if all VALUES * (expression) is of the
right sign (no signed constants when unsigned partition function)
SYNOPSIS
check_signed_flag()
part_info Partition info object
RETURN VALUES
0 No errors due to sign errors
>0 Sign error
*/
int check_signed_flag(partition_info *part_info)
{
int error= 0;
uint i= 0;
if (part_info->part_type != HASH_PARTITION &&
part_info->part_expr->unsigned_flag)
{
List_iterator<partition_element> part_it(part_info->partitions);
do
{
partition_element *part_elem= part_it++;
if (part_elem->signed_flag)
{
my_error(ER_PARTITION_CONST_DOMAIN_ERROR, MYF(0));
error= ER_PARTITION_CONST_DOMAIN_ERROR;
break;
}
} while (++i < part_info->num_parts);
}
return error;
}
/*
init_lex_with_single_table and end_lex_with_single_table
are now in sql_lex.cc
*/
/*
The function uses a new feature in fix_fields where the flag
GET_FIXED_FIELDS_FLAG is set for all fields in the item tree.
This field must always be reset before returning from the function
since it is used for other purposes as well.
SYNOPSIS
fix_fields_part_func()
thd The thread object
func_expr The item tree reference of the partition function
table The table object
part_info Reference to partitioning data structure
is_sub_part Is the table subpartitioned as well
is_create_table_ind Indicator of whether openfrm was called as part of
CREATE or ALTER TABLE
RETURN VALUE
TRUE An error occurred, something was wrong with the
partition function.
FALSE Ok, a partition field array was created
DESCRIPTION
This function is used to build an array of partition fields for the
partitioning function and subpartitioning function. The partitioning
function is an item tree that must reference at least one field in the
table. This is checked first in the parser that the function doesn't
contain non-cacheable parts (like a random function) and by checking
here that the function isn't a constant function.
Calculate the number of fields in the partition function.
Use it allocate memory for array of Field pointers.
Initialise array of field pointers. Use information set when
calling fix_fields and reset it immediately after.
The get_fields_in_item_tree activates setting of bit in flags
on the field object.
*/
static bool fix_fields_part_func(THD *thd, Item* func_expr, TABLE *table,
bool is_sub_part, bool is_create_table_ind)
{
partition_info *part_info= table->part_info;
bool result= TRUE;
int error;
LEX *old_lex= thd->lex;
LEX lex;
DBUG_ENTER("fix_fields_part_func");
if (init_lex_with_single_table(thd, table, &lex))
goto end;
table->get_fields_in_item_tree= true;
func_expr->walk(&Item::change_context_processor, 0, &lex.select_lex.context);
thd->where= "partition function";
/*
In execution we must avoid the use of thd->change_item_tree since
we might release memory before statement is completed. We do this
by temporarily setting the stmt_arena->mem_root to be the mem_root
of the table object, this also ensures that any memory allocated
during fix_fields will not be released at end of execution of this
statement. Thus the item tree will remain valid also in subsequent
executions of this table object. We do however not at the moment
support allocations during execution of val_int so any item class
that does this during val_int must be disallowed as partition
function.
SEE Bug #21658
This is a tricky call to prepare for since it can have a large number
of interesting side effects, both desirable and undesirable.
*/
{
const bool save_agg_field= thd->lex->current_select->non_agg_field_used();
const bool save_agg_func= thd->lex->current_select->agg_func_used();
const nesting_map saved_allow_sum_func= thd->lex->allow_sum_func;
thd->lex->allow_sum_func= 0;
if (!(error= func_expr->fix_fields(thd, (Item**)&func_expr)))
func_expr->walk(&Item::vcol_in_partition_func_processor, 0, NULL);
/*
Restore agg_field/agg_func and allow_sum_func,
fix_fields should not affect mysql_select later, see Bug#46923.
*/
thd->lex->current_select->set_non_agg_field_used(save_agg_field);
thd->lex->current_select->set_agg_func_used(save_agg_func);
thd->lex->allow_sum_func= saved_allow_sum_func;
}
if (unlikely(error))
{
DBUG_PRINT("info", ("Field in partition function not part of table"));
clear_field_flag(table);
goto end;
}
if (unlikely(func_expr->const_item()))
{
my_error(ER_WRONG_EXPR_IN_PARTITION_FUNC_ERROR, MYF(0));
clear_field_flag(table);
goto end;
}
/*
We don't allow creating partitions with expressions with non matching
arguments as a (sub)partitioning function,
but we want to allow such expressions when opening existing tables for
easier maintenance. This exception should be deprecated at some point
in future so that we always throw an error.
*/
if (func_expr->walk(&Item::check_valid_arguments_processor, 0, NULL))
{
if (is_create_table_ind)
{
my_error(ER_WRONG_EXPR_IN_PARTITION_FUNC_ERROR, MYF(0));
goto end;
}
else
push_warning(thd, Sql_condition::WARN_LEVEL_WARN,
ER_WRONG_EXPR_IN_PARTITION_FUNC_ERROR,
ER_THD(thd, ER_WRONG_EXPR_IN_PARTITION_FUNC_ERROR));
}
if ((!is_sub_part) && (error= check_signed_flag(part_info)))
goto end;
result= set_up_field_array(thd, table, is_sub_part);
end:
end_lex_with_single_table(thd, table, old_lex);
#if !defined(DBUG_OFF)
func_expr->walk(&Item::change_context_processor, 0, 0);
#endif
DBUG_RETURN(result);
}
/*
Check that the primary key contains all partition fields if defined
SYNOPSIS
check_primary_key()
table TABLE object for which partition fields are set-up
RETURN VALUES
TRUE Not all fields in partitioning function was part
of primary key
FALSE Ok, all fields of partitioning function were part
of primary key
DESCRIPTION
This function verifies that if there is a primary key that it contains
all the fields of the partition function.
This is a temporary limitation that will hopefully be removed after a
while.
*/
static bool check_primary_key(TABLE *table)
{
uint primary_key= table->s->primary_key;
bool all_fields, some_fields;
bool result= FALSE;
DBUG_ENTER("check_primary_key");
if (primary_key < MAX_KEY)
{
set_indicator_in_key_fields(table->key_info+primary_key);
check_fields_in_PF(table->part_info->full_part_field_array,
&all_fields, &some_fields);
clear_indicator_in_key_fields(table->key_info+primary_key);
if (unlikely(!all_fields))
{
my_error(ER_UNIQUE_KEY_NEED_ALL_FIELDS_IN_PF,MYF(0),"PRIMARY KEY");
result= TRUE;
}
}
DBUG_RETURN(result);
}
/*
Check that unique keys contains all partition fields
SYNOPSIS
check_unique_keys()
table TABLE object for which partition fields are set-up
RETURN VALUES
TRUE Not all fields in partitioning function was part
of all unique keys
FALSE Ok, all fields of partitioning function were part
of unique keys
DESCRIPTION
This function verifies that if there is a unique index that it contains
all the fields of the partition function.
This is a temporary limitation that will hopefully be removed after a
while.
*/
static bool check_unique_keys(TABLE *table)
{
bool all_fields, some_fields;
bool result= FALSE;
uint keys= table->s->keys;
uint i;
DBUG_ENTER("check_unique_keys");
for (i= 0; i < keys; i++)
{
if (table->key_info[i].flags & HA_NOSAME) //Unique index
{
set_indicator_in_key_fields(table->key_info+i);
check_fields_in_PF(table->part_info->full_part_field_array,
&all_fields, &some_fields);
clear_indicator_in_key_fields(table->key_info+i);
if (unlikely(!all_fields))
{
my_error(ER_UNIQUE_KEY_NEED_ALL_FIELDS_IN_PF,MYF(0),"UNIQUE INDEX");
result= TRUE;
break;
}
}
}
DBUG_RETURN(result);
}
/*
An important optimisation is whether a range on a field can select a subset
of the partitions.
A prerequisite for this to happen is that the PF is a growing function OR
a shrinking function.
This can never happen for a multi-dimensional PF. Thus this can only happen
with PF with at most one field involved in the PF.
The idea is that if the function is a growing function and you know that
the field of the PF is 4 <= A <= 6 then we can convert this to a range
in the PF instead by setting the range to PF(4) <= PF(A) <= PF(6). In the
case of RANGE PARTITIONING and LIST PARTITIONING this can be used to
calculate a set of partitions rather than scanning all of them.
Thus the following prerequisites are there to check if sets of partitions
can be found.
1) Only possible for RANGE and LIST partitioning (not for subpartitioning)
2) Only possible if PF only contains 1 field
3) Possible if PF is a growing function of the field
4) Possible if PF is a shrinking function of the field
OBSERVATION:
1) IF f1(A) is a growing function AND f2(A) is a growing function THEN
f1(A) + f2(A) is a growing function
f1(A) * f2(A) is a growing function if f1(A) >= 0 and f2(A) >= 0
2) IF f1(A) is a growing function and f2(A) is a shrinking function THEN
f1(A) / f2(A) is a growing function if f1(A) >= 0 and f2(A) > 0
3) IF A is a growing function then a function f(A) that removes the
least significant portion of A is a growing function
E.g. DATE(datetime) is a growing function
MONTH(datetime) is not a growing/shrinking function
4) IF f1(A) is a growing function and f2(A) is a growing function THEN
f1(f2(A)) and f2(f1(A)) are also growing functions
5) IF f1(A) is a shrinking function and f2(A) is a growing function THEN
f1(f2(A)) is a shrinking function and f2(f1(A)) is a shrinking function
6) f1(A) = A is a growing function
7) f1(A) = A*a + b (where a and b are constants) is a growing function
By analysing the item tree of the PF we can use these deducements and
derive whether the PF is a growing function or a shrinking function or
neither of it.
If the PF is range capable then a flag is set on the table object
indicating this to notify that we can use also ranges on the field
of the PF to deduce a set of partitions if the fields of the PF were
not all fully bound.
SYNOPSIS
check_range_capable_PF()
table TABLE object for which partition fields are set-up
DESCRIPTION
Support for this is not implemented yet.
*/
void check_range_capable_PF(TABLE *table)
{
DBUG_ENTER("check_range_capable_PF");
DBUG_VOID_RETURN;
}
/**
Set up partition bitmaps
@param thd Thread object
@param part_info Reference to partitioning data structure
@return Operation status
@retval TRUE Memory allocation failure
@retval FALSE Success
Allocate memory for bitmaps of the partitioned table
and initialise it.
*/
static bool set_up_partition_bitmaps(THD *thd, partition_info *part_info)
{
uint32 *bitmap_buf;
uint bitmap_bits= part_info->num_subparts?
(part_info->num_subparts* part_info->num_parts):
part_info->num_parts;
uint bitmap_bytes= bitmap_buffer_size(bitmap_bits);
DBUG_ENTER("set_up_partition_bitmaps");
DBUG_ASSERT(!part_info->bitmaps_are_initialized);
/* Allocate for both read and lock_partitions */
if (!(bitmap_buf= (uint32*) alloc_root(&part_info->table->mem_root,
bitmap_bytes * 2)))
{
mem_alloc_error(bitmap_bytes * 2);
DBUG_RETURN(TRUE);
}
my_bitmap_init(&part_info->read_partitions, bitmap_buf, bitmap_bits, FALSE);
/* Use the second half of the allocated buffer for lock_partitions */
my_bitmap_init(&part_info->lock_partitions, bitmap_buf + (bitmap_bytes / 4),
bitmap_bits, FALSE);
part_info->bitmaps_are_initialized= TRUE;
part_info->set_partition_bitmaps(NULL);
DBUG_RETURN(FALSE);
}
/*
Set up partition key maps
SYNOPSIS
set_up_partition_key_maps()
table TABLE object for which partition fields are set-up
part_info Reference to partitioning data structure
RETURN VALUES
None
DESCRIPTION
This function sets up a couple of key maps to be able to quickly check
if an index ever can be used to deduce the partition fields or even
a part of the fields of the partition function.
We set up the following key_map's.
PF = Partition Function
1) All fields of the PF is set even by equal on the first fields in the
key
2) All fields of the PF is set if all fields of the key is set
3) At least one field in the PF is set if all fields is set
4) At least one field in the PF is part of the key
*/
static void set_up_partition_key_maps(TABLE *table,
partition_info *part_info)
{
uint keys= table->s->keys;
uint i;
bool all_fields, some_fields;
DBUG_ENTER("set_up_partition_key_maps");
part_info->all_fields_in_PF.clear_all();
part_info->all_fields_in_PPF.clear_all();
part_info->all_fields_in_SPF.clear_all();
part_info->some_fields_in_PF.clear_all();
for (i= 0; i < keys; i++)
{
set_indicator_in_key_fields(table->key_info+i);
check_fields_in_PF(part_info->full_part_field_array,
&all_fields, &some_fields);
if (all_fields)
part_info->all_fields_in_PF.set_bit(i);
if (some_fields)
part_info->some_fields_in_PF.set_bit(i);
if (part_info->is_sub_partitioned())
{
check_fields_in_PF(part_info->part_field_array,
&all_fields, &some_fields);
if (all_fields)
part_info->all_fields_in_PPF.set_bit(i);
check_fields_in_PF(part_info->subpart_field_array,
&all_fields, &some_fields);
if (all_fields)
part_info->all_fields_in_SPF.set_bit(i);
}
clear_indicator_in_key_fields(table->key_info+i);
}
DBUG_VOID_RETURN;
}
/*
Set up function pointers for partition function
SYNOPSIS
set_up_partition_func_pointers()
part_info Reference to partitioning data structure
RETURN VALUE
NONE
DESCRIPTION
Set-up all function pointers for calculation of partition id,
subpartition id and the upper part in subpartitioning. This is to speed up
execution of get_partition_id which is executed once every record to be
written and deleted and twice for updates.
*/
static void set_up_partition_func_pointers(partition_info *part_info)
{
DBUG_ENTER("set_up_partition_func_pointers");
if (part_info->is_sub_partitioned())
{
part_info->get_partition_id= get_partition_id_with_sub;
if (part_info->part_type == RANGE_PARTITION)
{
if (part_info->column_list)
part_info->get_part_partition_id= get_partition_id_range_col;
else
part_info->get_part_partition_id= get_partition_id_range;
if (part_info->list_of_subpart_fields)
{
if (part_info->linear_hash_ind)
part_info->get_subpartition_id= get_partition_id_linear_key_sub;
else
part_info->get_subpartition_id= get_partition_id_key_sub;
}
else
{
if (part_info->linear_hash_ind)
part_info->get_subpartition_id= get_partition_id_linear_hash_sub;
else
part_info->get_subpartition_id= get_partition_id_hash_sub;
}
}
else /* LIST Partitioning */
{
if (part_info->column_list)
part_info->get_part_partition_id= get_partition_id_list_col;
else
part_info->get_part_partition_id= get_partition_id_list;
if (part_info->list_of_subpart_fields)
{
if (part_info->linear_hash_ind)
part_info->get_subpartition_id= get_partition_id_linear_key_sub;
else
part_info->get_subpartition_id= get_partition_id_key_sub;
}
else
{
if (part_info->linear_hash_ind)
part_info->get_subpartition_id= get_partition_id_linear_hash_sub;
else
part_info->get_subpartition_id= get_partition_id_hash_sub;
}
}
}
else /* No subpartitioning */
{
part_info->get_part_partition_id= NULL;
part_info->get_subpartition_id= NULL;
if (part_info->part_type == RANGE_PARTITION)
{
if (part_info->column_list)
part_info->get_partition_id= get_partition_id_range_col;
else
part_info->get_partition_id= get_partition_id_range;
}
else if (part_info->part_type == LIST_PARTITION)
{
if (part_info->column_list)
part_info->get_partition_id= get_partition_id_list_col;
else
part_info->get_partition_id= get_partition_id_list;
}
else /* HASH partitioning */
{
if (part_info->list_of_part_fields)
{
if (part_info->linear_hash_ind)
part_info->get_partition_id= get_partition_id_linear_key_nosub;
else
part_info->get_partition_id= get_partition_id_key_nosub;
}
else
{
if (part_info->linear_hash_ind)
part_info->get_partition_id= get_partition_id_linear_hash_nosub;
else
part_info->get_partition_id= get_partition_id_hash_nosub;
}
}
}
/*
We need special functions to handle character sets since they require copy
of field pointers and restore afterwards. For subpartitioned tables we do
the copy and restore individually on the part and subpart parts. For non-
subpartitioned tables we use the same functions as used for the parts part
of subpartioning.
Thus for subpartitioned tables the get_partition_id is always
get_partition_id_with_sub, even when character sets exists.
*/
if (part_info->part_charset_field_array)
{
if (part_info->is_sub_partitioned())
{
DBUG_ASSERT(part_info->get_part_partition_id);
if (!part_info->column_list)
{
part_info->get_part_partition_id_charset=
part_info->get_part_partition_id;
part_info->get_part_partition_id= get_part_id_charset_func_part;
}
}
else
{
DBUG_ASSERT(part_info->get_partition_id);
if (!part_info->column_list)
{
part_info->get_part_partition_id_charset= part_info->get_partition_id;
part_info->get_part_partition_id= get_part_id_charset_func_part;
}
}
}
if (part_info->subpart_charset_field_array)
{
DBUG_ASSERT(part_info->get_subpartition_id);
part_info->get_subpartition_id_charset=
part_info->get_subpartition_id;
part_info->get_subpartition_id= get_part_id_charset_func_subpart;
}
DBUG_VOID_RETURN;
}
/*
For linear hashing we need a mask which is on the form 2**n - 1 where
2**n >= num_parts. Thus if num_parts is 6 then mask is 2**3 - 1 = 8 - 1 = 7.
SYNOPSIS
set_linear_hash_mask()
part_info Reference to partitioning data structure
num_parts Number of parts in linear hash partitioning
RETURN VALUE
NONE
*/
void set_linear_hash_mask(partition_info *part_info, uint num_parts)
{
uint mask;
for (mask= 1; mask < num_parts; mask<<=1)
;
part_info->linear_hash_mask= mask - 1;
}
/*
This function calculates the partition id provided the result of the hash
function using linear hashing parameters, mask and number of partitions.
SYNOPSIS
get_part_id_from_linear_hash()
hash_value Hash value calculated by HASH function or KEY function
mask Mask calculated previously by set_linear_hash_mask
num_parts Number of partitions in HASH partitioned part
RETURN VALUE
part_id The calculated partition identity (starting at 0)
DESCRIPTION
The partition is calculated according to the theory of linear hashing.
See e.g. Linear hashing: a new tool for file and table addressing,
Reprinted from VLDB-80 in Readings Database Systems, 2nd ed, M. Stonebraker
(ed.), Morgan Kaufmann 1994.
*/
static uint32 get_part_id_from_linear_hash(longlong hash_value, uint mask,
uint num_parts)
{
uint32 part_id= (uint32)(hash_value & mask);
if (part_id >= num_parts)
{
uint new_mask= ((mask + 1) >> 1) - 1;
part_id= (uint32)(hash_value & new_mask);
}
return part_id;
}
/*
Check if a particular field is in need of character set
handling for partition functions.
SYNOPSIS
field_is_partition_charset()
field The field to check
RETURN VALUES
FALSE Not in need of character set handling
TRUE In need of character set handling
*/
bool field_is_partition_charset(Field *field)
{
if (!(field->type() == MYSQL_TYPE_STRING) &&
!(field->type() == MYSQL_TYPE_VARCHAR))
return FALSE;
{
CHARSET_INFO *cs= field->charset();
if (!(field->type() == MYSQL_TYPE_STRING) ||
!(cs->state & MY_CS_BINSORT))
return TRUE;
return FALSE;
}
}
/*
Check that partition function doesn't contain any forbidden
character sets and collations.
SYNOPSIS
check_part_func_fields()
ptr Array of Field pointers
ok_with_charsets Will we report allowed charset
fields as ok
RETURN VALUES
FALSE Success
TRUE Error
DESCRIPTION
We will check in this routine that the fields of the partition functions
do not contain unallowed parts. It can also be used to check if there
are fields that require special care by calling my_strnxfrm before
calling the functions to calculate partition id.
*/
bool check_part_func_fields(Field **ptr, bool ok_with_charsets)
{
Field *field;
DBUG_ENTER("check_part_func_fields");
while ((field= *(ptr++)))
{
/*
For CHAR/VARCHAR fields we need to take special precautions.
Binary collation with CHAR is automatically supported. Other
types need some kind of standardisation function handling
*/
if (field_is_partition_charset(field))
{
CHARSET_INFO *cs= field->charset();
if (!ok_with_charsets ||
cs->mbmaxlen > 1 ||
cs->strxfrm_multiply > 1)
{
DBUG_RETURN(TRUE);
}
}
}
DBUG_RETURN(FALSE);
}
/*
fix partition functions
SYNOPSIS
fix_partition_func()
thd The thread object
table TABLE object for which partition fields are set-up
is_create_table_ind Indicator of whether openfrm was called as part of
CREATE or ALTER TABLE
RETURN VALUE
TRUE Error
FALSE Success
DESCRIPTION
The name parameter contains the full table name and is used to get the
database name of the table which is used to set-up a correct
TABLE_LIST object for use in fix_fields.
NOTES
This function is called as part of opening the table by opening the .frm
file. It is a part of CREATE TABLE to do this so it is quite permissible
that errors due to erroneus syntax isn't found until we come here.
If the user has used a non-existing field in the table is one such example
of an error that is not discovered until here.
*/
bool fix_partition_func(THD *thd, TABLE *table,
bool is_create_table_ind)
{
bool result= TRUE;
partition_info *part_info= table->part_info;
enum_mark_columns save_mark_used_columns= thd->mark_used_columns;
DBUG_ENTER("fix_partition_func");
if (part_info->fixed)
{
DBUG_RETURN(FALSE);
}
thd->mark_used_columns= MARK_COLUMNS_NONE;
DBUG_PRINT("info", ("thd->mark_used_columns: %d", thd->mark_used_columns));
if (!is_create_table_ind ||
thd->lex->sql_command != SQLCOM_CREATE_TABLE)
{
if (partition_default_handling(thd, table, part_info,
is_create_table_ind,
table->s->normalized_path.str))
{
DBUG_RETURN(TRUE);
}
}
if (part_info->is_sub_partitioned())
{
DBUG_ASSERT(part_info->subpart_type == HASH_PARTITION);
/*
Subpartition is defined. We need to verify that subpartitioning
function is correct.
*/
if (part_info->linear_hash_ind)
set_linear_hash_mask(part_info, part_info->num_subparts);
if (part_info->list_of_subpart_fields)
{
List_iterator<const char> it(part_info->subpart_field_list);
if (unlikely(handle_list_of_fields(thd, it, table, part_info, TRUE)))
goto end;
}
else
{
if (unlikely(fix_fields_part_func(thd, part_info->subpart_expr,
table, TRUE, is_create_table_ind)))
goto end;
if (unlikely(part_info->subpart_expr->result_type() != INT_RESULT))
{
part_info->report_part_expr_error(TRUE);
goto end;
}
}
}
DBUG_ASSERT(part_info->part_type != NOT_A_PARTITION);
/*
Partition is defined. We need to verify that partitioning
function is correct.
*/
if (part_info->part_type == HASH_PARTITION)
{
if (part_info->linear_hash_ind)
set_linear_hash_mask(part_info, part_info->num_parts);
if (part_info->list_of_part_fields)
{
List_iterator<const char> it(part_info->part_field_list);
if (unlikely(handle_list_of_fields(thd, it, table, part_info, FALSE)))
goto end;
}
else
{
if (unlikely(fix_fields_part_func(thd, part_info->part_expr,
table, FALSE, is_create_table_ind)))
goto end;
if (unlikely(part_info->part_expr->result_type() != INT_RESULT))
{
part_info->report_part_expr_error(FALSE);
goto end;
}
}
part_info->fixed= TRUE;
}
else
{
const char *error_str;
if (part_info->column_list)
{
List_iterator<const char> it(part_info->part_field_list);
if (unlikely(handle_list_of_fields(thd, it, table, part_info, FALSE)))
goto end;
}
else
{
if (unlikely(fix_fields_part_func(thd, part_info->part_expr,
table, FALSE, is_create_table_ind)))
goto end;
}
part_info->fixed= TRUE;
if (part_info->part_type == RANGE_PARTITION)
{
error_str= partition_keywords[PKW_RANGE].str;
if (unlikely(part_info->check_range_constants(thd)))
goto end;
}
else if (part_info->part_type == LIST_PARTITION)
{
error_str= partition_keywords[PKW_LIST].str;
if (unlikely(part_info->check_list_constants(thd)))
goto end;
}
else
{
DBUG_ASSERT(0);
my_error(ER_INCONSISTENT_PARTITION_INFO_ERROR, MYF(0));
goto end;
}
if (unlikely(part_info->num_parts < 1))
{
my_error(ER_PARTITIONS_MUST_BE_DEFINED_ERROR, MYF(0), error_str);
goto end;
}
if (unlikely(!part_info->column_list &&
part_info->part_expr->result_type() != INT_RESULT))
{
part_info->report_part_expr_error(FALSE);
goto end;
}
}
if (((part_info->part_type != HASH_PARTITION ||
part_info->list_of_part_fields == FALSE) &&
!part_info->column_list &&
check_part_func_fields(part_info->part_field_array, TRUE)) ||
(part_info->list_of_subpart_fields == FALSE &&
part_info->is_sub_partitioned() &&
check_part_func_fields(part_info->subpart_field_array, TRUE)))
{
/*
Range/List/HASH (but not KEY) and not COLUMNS or HASH subpartitioning
with columns in the partitioning expression using unallowed charset.
*/
my_error(ER_PARTITION_FUNCTION_IS_NOT_ALLOWED, MYF(0));
goto end;
}
if (unlikely(create_full_part_field_array(thd, table, part_info)))
goto end;
if (unlikely(check_primary_key(table)))
goto end;
if (unlikely((!(table->s->db_type()->partition_flags &&
(table->s->db_type()->partition_flags() & HA_CAN_PARTITION_UNIQUE))) &&
check_unique_keys(table)))
goto end;
if (unlikely(set_up_partition_bitmaps(thd, part_info)))
goto end;
if (unlikely(part_info->set_up_charset_field_preps(thd)))
{
my_error(ER_PARTITION_FUNCTION_IS_NOT_ALLOWED, MYF(0));
goto end;
}
if (unlikely(part_info->check_partition_field_length()))
{
my_error(ER_PARTITION_FIELDS_TOO_LONG, MYF(0));
goto end;
}
check_range_capable_PF(table);
set_up_partition_key_maps(table, part_info);
set_up_partition_func_pointers(part_info);
set_up_range_analysis_info(part_info);
table->file->set_part_info(part_info);
result= FALSE;
end:
thd->mark_used_columns= save_mark_used_columns;
DBUG_PRINT("info", ("thd->mark_used_columns: %d", thd->mark_used_columns));
DBUG_RETURN(result);
}
/*
The code below is support routines for the reverse parsing of the
partitioning syntax. This feature is very useful to generate syntax for
all default values to avoid all default checking when opening the frm
file. It is also used when altering the partitioning by use of various
ALTER TABLE commands. Finally it is used for SHOW CREATE TABLES.
*/
static int add_write(File fptr, const char *buf, uint len)
{
uint ret_code= mysql_file_write(fptr, (const uchar*)buf, len, MYF(MY_FNABP));
if (likely(ret_code == 0))
return 0;
else
return 1;
}
static int add_string_object(File fptr, String *string)
{
return add_write(fptr, string->ptr(), string->length());
}
static int add_string(File fptr, const char *string)
{
return add_write(fptr, string, strlen(string));
}
static int add_string_len(File fptr, const char *string, uint len)
{
return add_write(fptr, string, len);
}
static int add_space(File fptr)
{
return add_string(fptr, space_str);
}
static int add_comma(File fptr)
{
return add_string(fptr, comma_str);
}
static int add_equal(File fptr)
{
return add_string(fptr, equal_str);
}
static int add_end_parenthesis(File fptr)
{
return add_string(fptr, end_paren_str);
}
static int add_begin_parenthesis(File fptr)
{
return add_string(fptr, begin_paren_str);
}
static int add_part_key_word(File fptr, const char *key_string)
{
int err= add_string(fptr, key_string);
err+= add_space(fptr);
return err;
}
static int add_partition(File fptr)
{
char buff[22];
strxmov(buff, part_str, space_str, NullS);
return add_string(fptr, buff);
}
static int add_subpartition(File fptr)
{
int err= add_string(fptr, sub_str);
return err + add_partition(fptr);
}
static int add_partition_by(File fptr)
{
char buff[22];
strxmov(buff, part_str, space_str, by_str, space_str, NullS);
return add_string(fptr, buff);
}
static int add_subpartition_by(File fptr)
{
int err= add_string(fptr, sub_str);
return err + add_partition_by(fptr);
}
static int add_part_field_list(File fptr, List<const char> field_list)
{
uint i, num_fields;
int err= 0;
List_iterator<const char> part_it(field_list);
num_fields= field_list.elements;
i= 0;
err+= add_begin_parenthesis(fptr);
while (i < num_fields)
{
const char *field_str= part_it++;
String field_string("", 0, system_charset_info);
THD *thd= current_thd;
ulonglong save_options= thd->variables.option_bits;
thd->variables.option_bits&= ~OPTION_QUOTE_SHOW_CREATE;
append_identifier(thd, &field_string, field_str,
strlen(field_str));
thd->variables.option_bits= save_options;
err+= add_string_object(fptr, &field_string);
if (i != (num_fields-1))
err+= add_comma(fptr);
i++;
}
err+= add_end_parenthesis(fptr);
return err;
}
static int add_name_string(File fptr, const char *name)
{
int err;
String name_string("", 0, system_charset_info);
THD *thd= current_thd;
ulonglong save_options= thd->variables.option_bits;
thd->variables.option_bits&= ~OPTION_QUOTE_SHOW_CREATE;
append_identifier(thd, &name_string, name,
strlen(name));
thd->variables.option_bits= save_options;
err= add_string_object(fptr, &name_string);
return err;
}
static int add_int(File fptr, longlong number)
{
char buff[32];
llstr(number, buff);
return add_string(fptr, buff);
}
static int add_uint(File fptr, ulonglong number)
{
char buff[32];
longlong2str(number, buff, 10);
return add_string(fptr, buff);
}
/*
Must escape strings in partitioned tables frm-files,
parsing it later with mysql_unpack_partition will fail otherwise.
*/
static int add_quoted_string(File fptr, const char *quotestr)
{
String escapedstr;
int err= add_string(fptr, "'");
err+= escapedstr.append_for_single_quote(quotestr);
err+= add_string(fptr, escapedstr.c_ptr_safe());
return err + add_string(fptr, "'");
}
/**
@brief Truncate the partition file name from a path it it exists.
@note A partition file name will contian one or more '#' characters.
One of the occurances of '#' will be either "#P#" or "#p#" depending
on whether the storage engine has converted the filename to lower case.
*/
void truncate_partition_filename(char *path)
{
if (path)
{
char* last_slash= strrchr(path, FN_LIBCHAR);
if (!last_slash)
last_slash= strrchr(path, FN_LIBCHAR2);
if (last_slash)
{
/* Look for a partition-type filename */
for (char* pound= strchr(last_slash, '#');
pound; pound = strchr(pound + 1, '#'))
{
if ((pound[1] == 'P' || pound[1] == 'p') && pound[2] == '#')
{
last_slash[0] = '\0'; /* truncate the file name */
break;
}
}
}
}
}
/**
@brief Output a filepath. Similar to add_keyword_string except it
also converts \ to / on Windows and skips the partition file name at
the end if found.
@note When Mysql sends a DATA DIRECTORY from SQL for partitions it does
not use a file name, but it does for DATA DIRECTORY on a non-partitioned
table. So when the storage engine is asked for the DATA DIRECTORY string
after a restart through Handler::update_create_options(), the storage
engine may include the filename.
*/
static int add_keyword_path(File fptr, const char *keyword,
const char *path)
{
int err= add_string(fptr, keyword);
err+= add_space(fptr);
err+= add_equal(fptr);
err+= add_space(fptr);
char temp_path[FN_REFLEN];
strcpy(temp_path, path);
#ifdef __WIN__
/* Convert \ to / to be able to create table on unix */
char *pos, *end;
uint length= strlen(temp_path);
for (pos= temp_path, end= pos+length ; pos < end ; pos++)
{
if (*pos == '\\')
*pos = '/';
}
#endif
/*
If the partition file name with its "#P#" identifier
is found after the last slash, truncate that filename.
*/
truncate_partition_filename(temp_path);
err+= add_quoted_string(fptr, temp_path);
return err + add_space(fptr);
}
static int add_keyword_string(File fptr, const char *keyword,
bool should_use_quotes,
const char *keystr)
{
int err= add_string(fptr, keyword);
err+= add_space(fptr);
err+= add_equal(fptr);
err+= add_space(fptr);
if (should_use_quotes)
err+= add_quoted_string(fptr, keystr);
else
err+= add_string(fptr, keystr);
return err + add_space(fptr);
}
static int add_keyword_int(File fptr, const char *keyword, longlong num)
{
int err= add_string(fptr, keyword);
err+= add_space(fptr);
err+= add_equal(fptr);
err+= add_space(fptr);
err+= add_int(fptr, num);
return err + add_space(fptr);
}
static int add_engine(File fptr, handlerton *engine_type)
{
const char *engine_str= ha_resolve_storage_engine_name(engine_type);
DBUG_PRINT("info", ("ENGINE: %s", engine_str));
int err= add_string(fptr, "ENGINE = ");
return err + add_string(fptr, engine_str);
}
static int add_partition_options(File fptr, partition_element *p_elem)
{
int err= 0;
err+= add_space(fptr);
if (p_elem->tablespace_name)
err+= add_keyword_string(fptr,"TABLESPACE", FALSE,
p_elem->tablespace_name);
if (p_elem->nodegroup_id != UNDEF_NODEGROUP)
err+= add_keyword_int(fptr,"NODEGROUP",(longlong)p_elem->nodegroup_id);
if (p_elem->part_max_rows)
err+= add_keyword_int(fptr,"MAX_ROWS",(longlong)p_elem->part_max_rows);
if (p_elem->part_min_rows)
err+= add_keyword_int(fptr,"MIN_ROWS",(longlong)p_elem->part_min_rows);
if (!(current_thd->variables.sql_mode & MODE_NO_DIR_IN_CREATE))
{
if (p_elem->data_file_name)
err+= add_keyword_path(fptr, "DATA DIRECTORY", p_elem->data_file_name);
if (p_elem->index_file_name)
err+= add_keyword_path(fptr, "INDEX DIRECTORY", p_elem->index_file_name);
}
if (p_elem->part_comment)
err+= add_keyword_string(fptr, "COMMENT", TRUE, p_elem->part_comment);
if (p_elem->connect_string.length)
err+= add_keyword_string(fptr, "CONNECTION", TRUE,
p_elem->connect_string.str);
return err + add_engine(fptr,p_elem->engine_type);
}
/*
Check partition fields for result type and if they need
to check the character set.
SYNOPSIS
check_part_field()
sql_type Type provided by user
field_name Name of field, used for error handling
result_type Out value: Result type of field
need_cs_check Out value: Do we need character set check
RETURN VALUES
TRUE Error
FALSE Ok
*/
static int check_part_field(enum_field_types sql_type,
const char *field_name,
Item_result *result_type,
bool *need_cs_check)
{
if (sql_type >= MYSQL_TYPE_TINY_BLOB &&
sql_type <= MYSQL_TYPE_BLOB)
{
my_error(ER_BLOB_FIELD_IN_PART_FUNC_ERROR, MYF(0));
return TRUE;
}
switch (sql_type)
{
case MYSQL_TYPE_TINY:
case MYSQL_TYPE_SHORT:
case MYSQL_TYPE_LONG:
case MYSQL_TYPE_LONGLONG:
case MYSQL_TYPE_INT24:
*result_type= INT_RESULT;
*need_cs_check= FALSE;
return FALSE;
case MYSQL_TYPE_NEWDATE:
case MYSQL_TYPE_DATE:
case MYSQL_TYPE_TIME:
case MYSQL_TYPE_DATETIME:
case MYSQL_TYPE_TIME2:
case MYSQL_TYPE_DATETIME2:
*result_type= STRING_RESULT;
*need_cs_check= TRUE;
return FALSE;
case MYSQL_TYPE_VARCHAR:
case MYSQL_TYPE_STRING:
case MYSQL_TYPE_VAR_STRING:
*result_type= STRING_RESULT;
*need_cs_check= TRUE;
return FALSE;
case MYSQL_TYPE_NEWDECIMAL:
case MYSQL_TYPE_DECIMAL:
case MYSQL_TYPE_TIMESTAMP:
case MYSQL_TYPE_TIMESTAMP2:
case MYSQL_TYPE_NULL:
case MYSQL_TYPE_FLOAT:
case MYSQL_TYPE_DOUBLE:
case MYSQL_TYPE_BIT:
case MYSQL_TYPE_ENUM:
case MYSQL_TYPE_SET:
case MYSQL_TYPE_GEOMETRY:
goto error;
default:
goto error;
}
error:
my_error(ER_FIELD_TYPE_NOT_ALLOWED_AS_PARTITION_FIELD, MYF(0),
field_name);
return TRUE;
}
/*
Find the given field's Create_field object using name of field
SYNOPSIS
get_sql_field()
field_name Field name
alter_info Info from ALTER TABLE/CREATE TABLE
RETURN VALUE
sql_field Object filled in by parser about field
NULL No field found
*/
static Create_field* get_sql_field(const char *field_name,
Alter_info *alter_info)
{
List_iterator<Create_field> it(alter_info->create_list);
Create_field *sql_field;
DBUG_ENTER("get_sql_field");
while ((sql_field= it++))
{
if (!(my_strcasecmp(system_charset_info,
sql_field->field_name.str,
field_name)))
{
DBUG_RETURN(sql_field);
}
}
DBUG_RETURN(NULL);
}
static int add_column_list_values(File fptr, partition_info *part_info,
part_elem_value *list_value,
HA_CREATE_INFO *create_info,
Alter_info *alter_info)
{
int err= 0;
uint i;
List_iterator<const char> it(part_info->part_field_list);
uint num_elements= part_info->part_field_list.elements;
bool use_parenthesis= (part_info->part_type == LIST_PARTITION &&
part_info->num_columns > 1U);
if (use_parenthesis)
err+= add_begin_parenthesis(fptr);
for (i= 0; i < num_elements; i++)
{
part_column_list_val *col_val= &list_value->col_val_array[i];
const char *field_name= it++;
if (col_val->max_value)
err+= add_string(fptr, partition_keywords[PKW_MAXVALUE].str);
else if (col_val->null_value)
err+= add_string(fptr, "NULL");
else
{
char buffer[MAX_KEY_LENGTH];
String str(buffer, sizeof(buffer), &my_charset_bin);
Item *item_expr= col_val->item_expression;
if (item_expr->null_value)
err+= add_string(fptr, "NULL");
else
{
String *res;
CHARSET_INFO *field_cs;
bool need_cs_check= FALSE;
Item_result result_type= STRING_RESULT;
/*
This function is called at a very early stage, even before
we have prepared the sql_field objects. Thus we have to
find the proper sql_field object and get the character set
from that object.
*/
if (create_info)
{
Create_field *sql_field;
if (!(sql_field= get_sql_field(field_name,
alter_info)))
{
my_error(ER_FIELD_NOT_FOUND_PART_ERROR, MYF(0));
return 1;
}
if (check_part_field(sql_field->real_field_type(),
sql_field->field_name.str,
&result_type,
&need_cs_check))
return 1;
if (need_cs_check)
field_cs= get_sql_field_charset(sql_field, create_info);
else
field_cs= NULL;
}
else
{
Field *field= part_info->part_field_array[i];
result_type= field->result_type();
if (check_part_field(field->real_type(),
field->field_name.str,
&result_type,
&need_cs_check))
return 1;
DBUG_ASSERT(result_type == field->result_type());
if (need_cs_check)
field_cs= field->charset();
else
field_cs= NULL;
}
if (result_type != item_expr->result_type())
{
my_error(ER_WRONG_TYPE_COLUMN_VALUE_ERROR, MYF(0));
return 1;
}
if (field_cs && field_cs != item_expr->collation.collation)
{
if (!(item_expr= convert_charset_partition_constant(item_expr,
field_cs)))
{
my_error(ER_PARTITION_FUNCTION_IS_NOT_ALLOWED, MYF(0));
return 1;
}
}
{
String val_conv;
val_conv.set_charset(system_charset_info);
res= item_expr->val_str(&str);
if (get_cs_converted_part_value_from_string(current_thd,
item_expr, res,
&val_conv, field_cs,
(bool)(alter_info != NULL)))
return 1;
err+= add_string_object(fptr, &val_conv);
}
}
}
if (i != (num_elements - 1))
err+= add_string(fptr, comma_str);
}
if (use_parenthesis)
err+= add_end_parenthesis(fptr);
return err;
}
static int add_partition_values(File fptr, partition_info *part_info,
partition_element *p_elem,
HA_CREATE_INFO *create_info,
Alter_info *alter_info)
{
int err= 0;
if (part_info->part_type == RANGE_PARTITION)
{
err+= add_string(fptr, " VALUES LESS THAN ");
if (part_info->column_list)
{
List_iterator<part_elem_value> list_val_it(p_elem->list_val_list);
part_elem_value *list_value= list_val_it++;
err+= add_begin_parenthesis(fptr);
err+= add_column_list_values(fptr, part_info, list_value,
create_info, alter_info);
err+= add_end_parenthesis(fptr);
}
else
{
if (!p_elem->max_value)
{
err+= add_begin_parenthesis(fptr);
if (p_elem->signed_flag)
err+= add_int(fptr, p_elem->range_value);
else
err+= add_uint(fptr, p_elem->range_value);
err+= add_end_parenthesis(fptr);
}
else
err+= add_string(fptr, partition_keywords[PKW_MAXVALUE].str);
}
}
else if (part_info->part_type == LIST_PARTITION)
{
uint i;
List_iterator<part_elem_value> list_val_it(p_elem->list_val_list);
if (p_elem->max_value)
{
DBUG_ASSERT(part_info->defined_max_value ||
current_thd->lex->sql_command == SQLCOM_ALTER_TABLE);
err+= add_string(fptr, " DEFAULT");
return err;
}
err+= add_string(fptr, " VALUES IN ");
uint num_items= p_elem->list_val_list.elements;
err+= add_begin_parenthesis(fptr);
if (p_elem->has_null_value)
{
err+= add_string(fptr, "NULL");
if (num_items == 0)
{
err+= add_end_parenthesis(fptr);
goto end;
}
err+= add_comma(fptr);
}
i= 0;
do
{
part_elem_value *list_value= list_val_it++;
if (part_info->column_list)
err+= add_column_list_values(fptr, part_info, list_value,
create_info, alter_info);
else
{
if (!list_value->unsigned_flag)
err+= add_int(fptr, list_value->value);
else
err+= add_uint(fptr, list_value->value);
}
if (i != (num_items-1))
err+= add_comma(fptr);
} while (++i < num_items);
err+= add_end_parenthesis(fptr);
}
end:
return err;
}
/**
Add 'KEY' word, with optional 'ALGORTIHM = N'.
@param fptr File to write to.
@param part_info partition_info holding the used key_algorithm
@param current_comment_start NULL, or comment string encapsulating the
PARTITION BY clause.
@return Operation status.
@retval 0 Success
@retval != 0 Failure
*/
static int add_key_with_algorithm(File fptr, partition_info *part_info,
const char *current_comment_start)
{
int err= 0;
err+= add_part_key_word(fptr, partition_keywords[PKW_KEY].str);
/*
current_comment_start is given when called from SHOW CREATE TABLE,
Then only add ALGORITHM = 1, not the default 2 or non-set 0!
For .frm current_comment_start is NULL, then add ALGORITHM if != 0.
*/
if (part_info->key_algorithm == partition_info::KEY_ALGORITHM_51 || // SHOW
(!current_comment_start && // .frm
(part_info->key_algorithm != partition_info::KEY_ALGORITHM_NONE)))
{
/* If we already are within a comment, end that comment first. */
if (current_comment_start)
err+= add_string(fptr, "*/ ");
err+= add_string(fptr, "/*!50611 ");
err+= add_part_key_word(fptr, partition_keywords[PKW_ALGORITHM].str);
err+= add_equal(fptr);
err+= add_space(fptr);
err+= add_int(fptr, part_info->key_algorithm);
err+= add_space(fptr);
err+= add_string(fptr, "*/ ");
if (current_comment_start)
{
/* Skip new line. */
if (current_comment_start[0] == '\n')
current_comment_start++;
err+= add_string(fptr, current_comment_start);
err+= add_space(fptr);
}
}
return err;
}
/*
Generate the partition syntax from the partition data structure.
Useful for support of generating defaults, SHOW CREATE TABLES
and easy partition management.
SYNOPSIS
generate_partition_syntax()
part_info The partitioning data structure
buf_length A pointer to the returned buffer length
use_sql_alloc Allocate buffer from sql_alloc if true
otherwise use my_malloc
show_partition_options Should we display partition options
create_info Info generated by parser
alter_info Info generated by parser
RETURN VALUES
NULL error
buf, buf_length Buffer and its length
DESCRIPTION
Here we will generate the full syntax for the given command where all
defaults have been expanded. By so doing the it is also possible to
make lots of checks of correctness while at it.
This could will also be reused for SHOW CREATE TABLES and also for all
type ALTER TABLE commands focusing on changing the PARTITION structure
in any fashion.
The implementation writes the syntax to a temporary file (essentially
an abstraction of a dynamic array) and if all writes goes well it
allocates a buffer and writes the syntax into this one and returns it.
As a security precaution the file is deleted before writing into it. This
means that no other processes on the machine can open and read the file
while this processing is ongoing.
The code is optimised for minimal code size since it is not used in any
common queries.
*/
char *generate_partition_syntax(THD *thd, partition_info *part_info,
uint *buf_length,
bool use_sql_alloc,
bool show_partition_options,
HA_CREATE_INFO *create_info,
Alter_info *alter_info,
const char *current_comment_start)
{
uint i,j, tot_num_parts, num_subparts;
partition_element *part_elem;
ulonglong buffer_length;
char path[FN_REFLEN];
int err= 0;
List_iterator<partition_element> part_it(part_info->partitions);
File fptr;
char *buf= NULL; //Return buffer
DBUG_ENTER("generate_partition_syntax");
if (unlikely(((fptr= create_temp_file(path,mysql_tmpdir,"psy",
O_RDWR | O_BINARY | O_TRUNC |
O_TEMPORARY, MYF(MY_WME)))) < 0))
DBUG_RETURN(NULL);
#ifndef __WIN__
unlink(path);
#endif
err+= add_space(fptr);
err+= add_partition_by(fptr);
switch (part_info->part_type)
{
case RANGE_PARTITION:
err+= add_part_key_word(fptr, partition_keywords[PKW_RANGE].str);
break;
case LIST_PARTITION:
err+= add_part_key_word(fptr, partition_keywords[PKW_LIST].str);
break;
case HASH_PARTITION:
if (part_info->linear_hash_ind)
err+= add_string(fptr, partition_keywords[PKW_LINEAR].str);
if (part_info->list_of_part_fields)
{
err+= add_key_with_algorithm(fptr, part_info,
current_comment_start);
err+= add_part_field_list(fptr, part_info->part_field_list);
}
else
err+= add_part_key_word(fptr, partition_keywords[PKW_HASH].str);
break;
default:
DBUG_ASSERT(0);
/* We really shouldn't get here, no use in continuing from here */
my_error(ER_OUT_OF_RESOURCES, MYF(ME_FATALERROR));
DBUG_RETURN(NULL);
}
if (part_info->part_expr)
{
err+= add_begin_parenthesis(fptr);
err+= add_string_len(fptr, part_info->part_func_string,
part_info->part_func_len);
err+= add_end_parenthesis(fptr);
}
else if (part_info->column_list)
{
err+= add_string(fptr, partition_keywords[PKW_COLUMNS].str);
err+= add_part_field_list(fptr, part_info->part_field_list);
}
if ((!part_info->use_default_num_partitions) &&
part_info->use_default_partitions)
{
err+= add_string(fptr, "\n");
err+= add_string(fptr, "PARTITIONS ");
err+= add_int(fptr, part_info->num_parts);
}
if (part_info->is_sub_partitioned())
{
err+= add_string(fptr, "\n");
err+= add_subpartition_by(fptr);
/* Must be hash partitioning for subpartitioning */
if (part_info->linear_hash_ind)
err+= add_string(fptr, partition_keywords[PKW_LINEAR].str);
if (part_info->list_of_subpart_fields)
{
err+= add_key_with_algorithm(fptr, part_info,
current_comment_start);
err+= add_part_field_list(fptr, part_info->subpart_field_list);
}
else
err+= add_part_key_word(fptr, partition_keywords[PKW_HASH].str);
if (part_info->subpart_expr)
{
err+= add_begin_parenthesis(fptr);
err+= add_string_len(fptr, part_info->subpart_func_string,
part_info->subpart_func_len);
err+= add_end_parenthesis(fptr);
}
if ((!part_info->use_default_num_subpartitions) &&
part_info->use_default_subpartitions)
{
err+= add_string(fptr, "\n");
err+= add_string(fptr, "SUBPARTITIONS ");
err+= add_int(fptr, part_info->num_subparts);
}
}
tot_num_parts= part_info->partitions.elements;
num_subparts= part_info->num_subparts;
if (!part_info->use_default_partitions)
{
bool first= TRUE;
err+= add_string(fptr, "\n");
err+= add_begin_parenthesis(fptr);
i= 0;
do
{
part_elem= part_it++;
if (part_elem->part_state != PART_TO_BE_DROPPED &&
part_elem->part_state != PART_REORGED_DROPPED)
{
if (!first)
{
err+= add_comma(fptr);
err+= add_string(fptr, "\n");
err+= add_space(fptr);
}
first= FALSE;
err+= add_partition(fptr);
err+= add_name_string(fptr, part_elem->partition_name);
err+= add_partition_values(fptr, part_info, part_elem,
create_info, alter_info);
if (!part_info->is_sub_partitioned() ||
part_info->use_default_subpartitions)
{
if (show_partition_options)
err+= add_partition_options(fptr, part_elem);
}
else
{
err+= add_string(fptr, "\n");
err+= add_space(fptr);
err+= add_begin_parenthesis(fptr);
List_iterator<partition_element> sub_it(part_elem->subpartitions);
j= 0;
do
{
part_elem= sub_it++;
err+= add_subpartition(fptr);
err+= add_name_string(fptr, part_elem->partition_name);
if (show_partition_options)
err+= add_partition_options(fptr, part_elem);
if (j != (num_subparts-1))
{
err+= add_comma(fptr);
err+= add_string(fptr, "\n");
err+= add_space(fptr);
err+= add_space(fptr);
}
else
err+= add_end_parenthesis(fptr);
} while (++j < num_subparts);
}
}
if (i == (tot_num_parts-1))
err+= add_end_parenthesis(fptr);
} while (++i < tot_num_parts);
}
if (err)
goto close_file;
buffer_length= mysql_file_seek(fptr, 0L, MY_SEEK_END, MYF(0));
if (unlikely(buffer_length == MY_FILEPOS_ERROR))
goto close_file;
if (unlikely(mysql_file_seek(fptr, 0L, MY_SEEK_SET, MYF(0))
== MY_FILEPOS_ERROR))
goto close_file;
*buf_length= (uint)buffer_length;
if (use_sql_alloc)
buf= (char*) thd->alloc(*buf_length + 1);
else
buf= (char*) my_malloc(*buf_length+1, MYF(MY_WME));
if (!buf)
goto close_file;
if (unlikely(mysql_file_read(fptr, (uchar*)buf, *buf_length, MYF(MY_FNABP))))
{
if (!use_sql_alloc)
my_free(buf);
buf= NULL;
}
else
buf[*buf_length]= 0;
close_file:
mysql_file_close(fptr, MYF(0));
DBUG_RETURN(buf);
}
/*
Check if partition key fields are modified and if it can be handled by the
underlying storage engine.
SYNOPSIS
partition_key_modified
table TABLE object for which partition fields are set-up
fields Bitmap representing fields to be modified
RETURN VALUES
TRUE Need special handling of UPDATE
FALSE Normal UPDATE handling is ok
*/
bool partition_key_modified(TABLE *table, const MY_BITMAP *fields)
{
Field **fld;
partition_info *part_info= table->part_info;
DBUG_ENTER("partition_key_modified");
if (!part_info)
DBUG_RETURN(FALSE);
if (table->s->db_type()->partition_flags &&
(table->s->db_type()->partition_flags() & HA_CAN_UPDATE_PARTITION_KEY))
DBUG_RETURN(FALSE);
for (fld= part_info->full_part_field_array; *fld; fld++)
if (bitmap_is_set(fields, (*fld)->field_index))
DBUG_RETURN(TRUE);
DBUG_RETURN(FALSE);
}
/*
A function to handle correct handling of NULL values in partition
functions.
SYNOPSIS
part_val_int()
item_expr The item expression to evaluate
out:result The value of the partition function,
LONGLONG_MIN if any null value in function
RETURN VALUES
TRUE Error in val_int()
FALSE ok
*/
static inline int part_val_int(Item *item_expr, longlong *result)
{
*result= item_expr->val_int();
if (item_expr->null_value)
{
if (current_thd->is_error())
return TRUE;
else
*result= LONGLONG_MIN;
}
return FALSE;
}
/*
The next set of functions are used to calculate the partition identity.
A handler sets up a variable that corresponds to one of these functions
to be able to quickly call it whenever the partition id needs to calculated
based on the record in table->record[0] (or set up to fake that).
There are 4 functions for hash partitioning and 2 for RANGE/LIST partitions.
In addition there are 4 variants for RANGE subpartitioning and 4 variants
for LIST subpartitioning thus in total there are 14 variants of this
function.
We have a set of support functions for these 14 variants. There are 4
variants of hash functions and there is a function for each. The KEY
partitioning uses the function calculate_key_hash_value to calculate the hash
value based on an array of fields. The linear hash variants uses the
method get_part_id_from_linear_hash to get the partition id using the
hash value and some parameters calculated from the number of partitions.
*/
/*
A simple support function to calculate part_id given local part and
sub part.
SYNOPSIS
get_part_id_for_sub()
loc_part_id Local partition id
sub_part_id Subpartition id
num_subparts Number of subparts
*/
inline
static uint32 get_part_id_for_sub(uint32 loc_part_id, uint32 sub_part_id,
uint num_subparts)
{
return (uint32)((loc_part_id * num_subparts) + sub_part_id);
}
/*
Calculate part_id for (SUB)PARTITION BY HASH
SYNOPSIS
get_part_id_hash()
num_parts Number of hash partitions
part_expr Item tree of hash function
out:part_id The returned partition id
out:func_value Value of hash function
RETURN VALUE
!= 0 Error code
FALSE Success
*/
static int get_part_id_hash(uint num_parts,
Item *part_expr,
uint32 *part_id,
longlong *func_value)
{
longlong int_hash_id;
DBUG_ENTER("get_part_id_hash");
if (part_val_int(part_expr, func_value))
DBUG_RETURN(HA_ERR_NO_PARTITION_FOUND);
int_hash_id= *func_value % num_parts;
*part_id= int_hash_id < 0 ? (uint32) -int_hash_id : (uint32) int_hash_id;
DBUG_RETURN(FALSE);
}
/*
Calculate part_id for (SUB)PARTITION BY LINEAR HASH
SYNOPSIS
get_part_id_linear_hash()
part_info A reference to the partition_info struct where all the
desired information is given
num_parts Number of hash partitions
part_expr Item tree of hash function
out:part_id The returned partition id
out:func_value Value of hash function
RETURN VALUE
!= 0 Error code
0 OK
*/
static int get_part_id_linear_hash(partition_info *part_info,
uint num_parts,
Item *part_expr,
uint32 *part_id,
longlong *func_value)
{
DBUG_ENTER("get_part_id_linear_hash");
if (part_val_int(part_expr, func_value))
DBUG_RETURN(HA_ERR_NO_PARTITION_FOUND);
*part_id= get_part_id_from_linear_hash(*func_value,
part_info->linear_hash_mask,
num_parts);
DBUG_RETURN(FALSE);
}
/**
Calculate part_id for (SUB)PARTITION BY KEY
@param file Handler to storage engine
@param field_array Array of fields for PARTTION KEY
@param num_parts Number of KEY partitions
@param func_value[out] Returns calculated hash value
@return Calculated partition id
*/
inline
static uint32 get_part_id_key(handler *file,
Field **field_array,
uint num_parts,
longlong *func_value)
{
DBUG_ENTER("get_part_id_key");
*func_value= ha_partition::calculate_key_hash_value(field_array);
DBUG_RETURN((uint32) (*func_value % num_parts));
}
/*
Calculate part_id for (SUB)PARTITION BY LINEAR KEY
SYNOPSIS
get_part_id_linear_key()
part_info A reference to the partition_info struct where all the
desired information is given
field_array Array of fields for PARTTION KEY
num_parts Number of KEY partitions
RETURN VALUE
Calculated partition id
*/
inline
static uint32 get_part_id_linear_key(partition_info *part_info,
Field **field_array,
uint num_parts,
longlong *func_value)
{
DBUG_ENTER("get_part_id_linear_key");
*func_value= ha_partition::calculate_key_hash_value(field_array);
DBUG_RETURN(get_part_id_from_linear_hash(*func_value,
part_info->linear_hash_mask,
num_parts));
}
/*
Copy to field buffers and set up field pointers
SYNOPSIS
copy_to_part_field_buffers()
ptr Array of fields to copy
field_bufs Array of field buffers to copy to
restore_ptr Array of pointers to restore to
RETURN VALUES
NONE
DESCRIPTION
This routine is used to take the data from field pointer, convert
it to a standard format and store this format in a field buffer
allocated for this purpose. Next the field pointers are moved to
point to the field buffers. There is a separate to restore the
field pointers after this call.
*/
static void copy_to_part_field_buffers(Field **ptr,
uchar **field_bufs,
uchar **restore_ptr)
{
Field *field;
while ((field= *(ptr++)))
{
*restore_ptr= field->ptr;
restore_ptr++;
if (!field->maybe_null() || !field->is_null())
{
CHARSET_INFO *cs= field->charset();
uint max_len= field->pack_length();
uint data_len= field->data_length();
uchar *field_buf= *field_bufs;
/*
We only use the field buffer for VARCHAR and CHAR strings
which isn't of a binary collation. We also only use the
field buffer for fields which are not currently NULL.
The field buffer will store a normalised string. We use
the strnxfrm method to normalise the string.
*/
if (field->type() == MYSQL_TYPE_VARCHAR)
{
uint len_bytes= ((Field_varstring*)field)->length_bytes;
my_strnxfrm(cs, field_buf + len_bytes, max_len,
field->ptr + len_bytes, data_len);
if (len_bytes == 1)
*field_buf= (uchar) data_len;
else
int2store(field_buf, data_len);
}
else
{
my_strnxfrm(cs, field_buf, max_len,
field->ptr, max_len);
}
field->ptr= field_buf;
}
field_bufs++;
}
return;
}
/*
Restore field pointers
SYNOPSIS
restore_part_field_pointers()
ptr Array of fields to restore
restore_ptr Array of field pointers to restore to
RETURN VALUES
*/
static void restore_part_field_pointers(Field **ptr, uchar **restore_ptr)
{
Field *field;
while ((field= *(ptr++)))
{
field->ptr= *restore_ptr;
restore_ptr++;
}
return;
}
/*
This function is used to calculate the partition id where all partition
fields have been prepared to point to a record where the partition field
values are bound.
SYNOPSIS
get_partition_id()
part_info A reference to the partition_info struct where all the
desired information is given
out:part_id The partition id is returned through this pointer
out:func_value Value of partition function (longlong)
RETURN VALUE
part_id Partition id of partition that would contain
row with given values of PF-fields
HA_ERR_NO_PARTITION_FOUND The fields of the partition function didn't
fit into any partition and thus the values of
the PF-fields are not allowed.
DESCRIPTION
A routine used from write_row, update_row and delete_row from any
handler supporting partitioning. It is also a support routine for
get_partition_set used to find the set of partitions needed to scan
for a certain index scan or full table scan.
It is actually 9 different variants of this function which are called
through a function pointer.
get_partition_id_list
get_partition_id_list_col
get_partition_id_range
get_partition_id_range_col
get_partition_id_hash_nosub
get_partition_id_key_nosub
get_partition_id_linear_hash_nosub
get_partition_id_linear_key_nosub
get_partition_id_with_sub
*/
/*
This function is used to calculate the main partition to use in the case of
subpartitioning and we don't know enough to get the partition identity in
total.
SYNOPSIS
get_part_partition_id()
part_info A reference to the partition_info struct where all the
desired information is given
out:part_id The partition id is returned through this pointer
out:func_value The value calculated by partition function
RETURN VALUE
HA_ERR_NO_PARTITION_FOUND The fields of the partition function didn't
fit into any partition and thus the values of
the PF-fields are not allowed.
0 OK
DESCRIPTION
It is actually 8 different variants of this function which are called
through a function pointer.
get_partition_id_list
get_partition_id_list_col
get_partition_id_range
get_partition_id_range_col
get_partition_id_hash_nosub
get_partition_id_key_nosub
get_partition_id_linear_hash_nosub
get_partition_id_linear_key_nosub
*/
static int get_part_id_charset_func_part(partition_info *part_info,
uint32 *part_id,
longlong *func_value)
{
int res;
DBUG_ENTER("get_part_id_charset_func_part");
copy_to_part_field_buffers(part_info->part_charset_field_array,
part_info->part_field_buffers,
part_info->restore_part_field_ptrs);
res= part_info->get_part_partition_id_charset(part_info,
part_id, func_value);
restore_part_field_pointers(part_info->part_charset_field_array,
part_info->restore_part_field_ptrs);
DBUG_RETURN(res);
}
static int get_part_id_charset_func_subpart(partition_info *part_info,
uint32 *part_id)
{
int res;
DBUG_ENTER("get_part_id_charset_func_subpart");
copy_to_part_field_buffers(part_info->subpart_charset_field_array,
part_info->subpart_field_buffers,
part_info->restore_subpart_field_ptrs);
res= part_info->get_subpartition_id_charset(part_info, part_id);
restore_part_field_pointers(part_info->subpart_charset_field_array,
part_info->restore_subpart_field_ptrs);
DBUG_RETURN(res);
}
int get_partition_id_list_col(partition_info *part_info,
uint32 *part_id,
longlong *func_value)
{
part_column_list_val *list_col_array= part_info->list_col_array;
uint num_columns= part_info->part_field_list.elements;
int list_index, cmp;
int min_list_index= 0;
int max_list_index= part_info->num_list_values - 1;
DBUG_ENTER("get_partition_id_list_col");
while (max_list_index >= min_list_index)
{
list_index= (max_list_index + min_list_index) >> 1;
cmp= cmp_rec_and_tuple(list_col_array + list_index*num_columns,
num_columns);
if (cmp > 0)
min_list_index= list_index + 1;
else if (cmp < 0)
{
if (!list_index)
goto notfound;
max_list_index= list_index - 1;
}
else
{
*part_id= (uint32)list_col_array[list_index*num_columns].partition_id;
DBUG_RETURN(0);
}
}
notfound:
if (part_info->defined_max_value)
{
*part_id= part_info->default_partition_id;
DBUG_RETURN(0);
}
*part_id= 0;
DBUG_RETURN(HA_ERR_NO_PARTITION_FOUND);
}
int get_partition_id_list(partition_info *part_info,
uint32 *part_id,
longlong *func_value)
{
LIST_PART_ENTRY *list_array= part_info->list_array;
int list_index;
int min_list_index= 0;
int max_list_index= part_info->num_list_values - 1;
longlong part_func_value;
int error= part_val_int(part_info->part_expr, &part_func_value);
longlong list_value;
bool unsigned_flag= part_info->part_expr->unsigned_flag;
DBUG_ENTER("get_partition_id_list");
if (error)
goto notfound;
if (part_info->part_expr->null_value)
{
if (part_info->has_null_value)
{
*part_id= part_info->has_null_part_id;
DBUG_RETURN(0);
}
goto notfound;
}
*func_value= part_func_value;
if (unsigned_flag)
part_func_value-= 0x8000000000000000ULL;
while (max_list_index >= min_list_index)
{
list_index= (max_list_index + min_list_index) >> 1;
list_value= list_array[list_index].list_value;
if (list_value < part_func_value)
min_list_index= list_index + 1;
else if (list_value > part_func_value)
{
if (!list_index)
goto notfound;
max_list_index= list_index - 1;
}
else
{
*part_id= (uint32)list_array[list_index].partition_id;
DBUG_RETURN(0);
}
}
notfound:
if (part_info->defined_max_value)
{
*part_id= part_info->default_partition_id;
DBUG_RETURN(0);
}
*part_id= 0;
DBUG_RETURN(HA_ERR_NO_PARTITION_FOUND);
}
uint32 get_partition_id_cols_list_for_endpoint(partition_info *part_info,
bool left_endpoint,
bool include_endpoint,
uint32 nparts)
{
part_column_list_val *list_col_array= part_info->list_col_array;
uint num_columns= part_info->part_field_list.elements;
uint list_index;
uint min_list_index= 0;
int cmp;
/* Notice that max_list_index = last_index + 1 here! */
uint max_list_index= part_info->num_list_values;
DBUG_ENTER("get_partition_id_cols_list_for_endpoint");
/* Find the matching partition (including taking endpoint into account). */
do
{
/* Midpoint, adjusted down, so it can never be >= max_list_index. */
list_index= (max_list_index + min_list_index) >> 1;
cmp= cmp_rec_and_tuple_prune(list_col_array + list_index*num_columns,
nparts, left_endpoint, include_endpoint);
if (cmp > 0)
{
min_list_index= list_index + 1;
}
else
{
max_list_index= list_index;
if (cmp == 0)
break;
}
} while (max_list_index > min_list_index);
list_index= max_list_index;
/* Given value must be LESS THAN or EQUAL to the found partition. */
DBUG_ASSERT(list_index == part_info->num_list_values ||
(0 >= cmp_rec_and_tuple_prune(list_col_array +
list_index*num_columns,
nparts, left_endpoint,
include_endpoint)));
/* Given value must be GREATER THAN the previous partition. */
DBUG_ASSERT(list_index == 0 ||
(0 < cmp_rec_and_tuple_prune(list_col_array +
(list_index - 1)*num_columns,
nparts, left_endpoint,
include_endpoint)));
/* Include the right endpoint if not already passed end of array. */
if (!left_endpoint && include_endpoint && cmp == 0 &&
list_index < part_info->num_list_values)
list_index++;
DBUG_RETURN(list_index);
}
/**
Find the sub-array part_info->list_array that corresponds to given interval.
@param part_info Partitioning info (partitioning type must be LIST)
@param left_endpoint TRUE - the interval is [a; +inf) or (a; +inf)
FALSE - the interval is (-inf; a] or (-inf; a)
@param include_endpoint TRUE iff the interval includes the endpoint
This function finds the sub-array of part_info->list_array where values of
list_array[idx].list_value are contained within the specifed interval.
list_array is ordered by list_value, so
1. For [a; +inf) or (a; +inf)-type intervals (left_endpoint==TRUE), the
sought sub-array starts at some index idx and continues till array end.
The function returns first number idx, such that
list_array[idx].list_value is contained within the passed interval.
2. For (-inf; a] or (-inf; a)-type intervals (left_endpoint==FALSE), the
sought sub-array starts at array start and continues till some last
index idx.
The function returns first number idx, such that
list_array[idx].list_value is NOT contained within the passed interval.
If all array elements are contained, part_info->num_list_values is
returned.
@note The caller will call this function and then will run along the
sub-array of list_array to collect partition ids. If the number of list
values is significantly higher then number of partitions, this could be slow
and we could invent some other approach. The "run over list array" part is
already wrapped in a get_next()-like function.
@return The index of corresponding sub-array of part_info->list_array.
*/
uint32 get_list_array_idx_for_endpoint_charset(partition_info *part_info,
bool left_endpoint,
bool include_endpoint)
{
uint32 res;
copy_to_part_field_buffers(part_info->part_field_array,
part_info->part_field_buffers,
part_info->restore_part_field_ptrs);
res= get_list_array_idx_for_endpoint(part_info, left_endpoint,
include_endpoint);
restore_part_field_pointers(part_info->part_field_array,
part_info->restore_part_field_ptrs);
return res;
}
uint32 get_list_array_idx_for_endpoint(partition_info *part_info,
bool left_endpoint,
bool include_endpoint)
{
LIST_PART_ENTRY *list_array= part_info->list_array;
uint list_index;
uint min_list_index= 0, max_list_index= part_info->num_list_values - 1;
longlong list_value;
/* Get the partitioning function value for the endpoint */
longlong part_func_value=
part_info->part_expr->val_int_endpoint(left_endpoint, &include_endpoint);
bool unsigned_flag= part_info->part_expr->unsigned_flag;
DBUG_ENTER("get_list_array_idx_for_endpoint");
if (part_info->part_expr->null_value)
{
/*
Special handling for MONOTONIC functions that can return NULL for
values that are comparable. I.e.
'2000-00-00' can be compared to '2000-01-01' but TO_DAYS('2000-00-00')
returns NULL which cannot be compared used <, >, <=, >= etc.
Otherwise, just return the the first index (lowest value).
*/
enum_monotonicity_info monotonic;
monotonic= part_info->part_expr->get_monotonicity_info();
if (monotonic != MONOTONIC_INCREASING_NOT_NULL &&
monotonic != MONOTONIC_STRICT_INCREASING_NOT_NULL)
{
/* F(col) can not return NULL, return index with lowest value */
DBUG_RETURN(0);
}
}
if (unsigned_flag)
part_func_value-= 0x8000000000000000ULL;
DBUG_ASSERT(part_info->num_list_values);
do
{
list_index= (max_list_index + min_list_index) >> 1;
list_value= list_array[list_index].list_value;
if (list_value < part_func_value)
min_list_index= list_index + 1;
else if (list_value > part_func_value)
{
if (!list_index)
goto notfound;
max_list_index= list_index - 1;
}
else
{
DBUG_RETURN(list_index + MY_TEST(left_endpoint ^ include_endpoint));
}
} while (max_list_index >= min_list_index);
notfound:
if (list_value < part_func_value)
list_index++;
DBUG_RETURN(list_index);
}
int get_partition_id_range_col(partition_info *part_info,
uint32 *part_id,
longlong *func_value)
{
part_column_list_val *range_col_array= part_info->range_col_array;
uint num_columns= part_info->part_field_list.elements;
uint max_partition= part_info->num_parts - 1;
uint min_part_id= 0;
uint max_part_id= max_partition;
uint loc_part_id;
DBUG_ENTER("get_partition_id_range_col");
while (max_part_id > min_part_id)
{
loc_part_id= (max_part_id + min_part_id + 1) >> 1;
if (cmp_rec_and_tuple(range_col_array + loc_part_id*num_columns,
num_columns) >= 0)
min_part_id= loc_part_id + 1;
else
max_part_id= loc_part_id - 1;
}
loc_part_id= max_part_id;
if (loc_part_id != max_partition)
if (cmp_rec_and_tuple(range_col_array + loc_part_id*num_columns,
num_columns) >= 0)
loc_part_id++;
*part_id= (uint32)loc_part_id;
if (loc_part_id == max_partition &&
(cmp_rec_and_tuple(range_col_array + loc_part_id*num_columns,
num_columns) >= 0))
DBUG_RETURN(HA_ERR_NO_PARTITION_FOUND);
DBUG_PRINT("exit",("partition: %d", *part_id));
DBUG_RETURN(0);
}
int get_partition_id_range(partition_info *part_info,
uint32 *part_id,
longlong *func_value)
{
longlong *range_array= part_info->range_int_array;
uint max_partition= part_info->num_parts - 1;
uint min_part_id= 0;
uint max_part_id= max_partition;
uint loc_part_id;
longlong part_func_value;
int error= part_val_int(part_info->part_expr, &part_func_value);
bool unsigned_flag= part_info->part_expr->unsigned_flag;
DBUG_ENTER("get_partition_id_range");
if (error)
DBUG_RETURN(HA_ERR_NO_PARTITION_FOUND);
if (part_info->part_expr->null_value)
{
*part_id= 0;
DBUG_RETURN(0);
}
*func_value= part_func_value;
if (unsigned_flag)
part_func_value-= 0x8000000000000000ULL;
/* Search for the partition containing part_func_value */
while (max_part_id > min_part_id)
{
loc_part_id= (max_part_id + min_part_id) / 2;
if (range_array[loc_part_id] <= part_func_value)
min_part_id= loc_part_id + 1;
else
max_part_id= loc_part_id;
}
loc_part_id= max_part_id;
*part_id= (uint32)loc_part_id;
if (loc_part_id == max_partition &&
part_func_value >= range_array[loc_part_id] &&
!part_info->defined_max_value)
DBUG_RETURN(HA_ERR_NO_PARTITION_FOUND);
DBUG_PRINT("exit",("partition: %d", *part_id));
DBUG_RETURN(0);
}
/*
Find the sub-array of part_info->range_int_array that covers given interval
SYNOPSIS
get_partition_id_range_for_endpoint()
part_info Partitioning info (partitioning type must be RANGE)
left_endpoint TRUE - the interval is [a; +inf) or (a; +inf)
FALSE - the interval is (-inf; a] or (-inf; a).
include_endpoint TRUE <=> the endpoint itself is included in the
interval
DESCRIPTION
This function finds the sub-array of part_info->range_int_array where the
elements have non-empty intersections with the given interval.
A range_int_array element at index idx represents the interval
[range_int_array[idx-1], range_int_array[idx]),
intervals are disjoint and ordered by their right bound, so
1. For [a; +inf) or (a; +inf)-type intervals (left_endpoint==TRUE), the
sought sub-array starts at some index idx and continues till array end.
The function returns first number idx, such that the interval
represented by range_int_array[idx] has non empty intersection with
the passed interval.
2. For (-inf; a] or (-inf; a)-type intervals (left_endpoint==FALSE), the
sought sub-array starts at array start and continues till some last
index idx.
The function returns first number idx, such that the interval
represented by range_int_array[idx] has EMPTY intersection with the
passed interval.
If the interval represented by the last array element has non-empty
intersection with the passed interval, part_info->num_parts is
returned.
RETURN
The edge of corresponding part_info->range_int_array sub-array.
*/
static uint32
get_partition_id_range_for_endpoint_charset(partition_info *part_info,
bool left_endpoint,
bool include_endpoint)
{
uint32 res;
copy_to_part_field_buffers(part_info->part_field_array,
part_info->part_field_buffers,
part_info->restore_part_field_ptrs);
res= get_partition_id_range_for_endpoint(part_info, left_endpoint,
include_endpoint);
restore_part_field_pointers(part_info->part_field_array,
part_info->restore_part_field_ptrs);
return res;
}
uint32 get_partition_id_range_for_endpoint(partition_info *part_info,
bool left_endpoint,
bool include_endpoint)
{
longlong *range_array= part_info->range_int_array;
longlong part_end_val;
uint max_partition= part_info->num_parts - 1;
uint min_part_id= 0, max_part_id= max_partition, loc_part_id;
/* Get the partitioning function value for the endpoint */
longlong part_func_value=
part_info->part_expr->val_int_endpoint(left_endpoint, &include_endpoint);
bool unsigned_flag= part_info->part_expr->unsigned_flag;
DBUG_ENTER("get_partition_id_range_for_endpoint");
if (part_info->part_expr->null_value)
{
/*
Special handling for MONOTONIC functions that can return NULL for
values that are comparable. I.e.
'2000-00-00' can be compared to '2000-01-01' but TO_DAYS('2000-00-00')
returns NULL which cannot be compared used <, >, <=, >= etc.
Otherwise, just return the first partition
(may be included if not left endpoint)
*/
enum_monotonicity_info monotonic;
monotonic= part_info->part_expr->get_monotonicity_info();
if (monotonic != MONOTONIC_INCREASING_NOT_NULL &&
monotonic != MONOTONIC_STRICT_INCREASING_NOT_NULL)
{
/* F(col) can not return NULL, return partition with lowest value */
if (!left_endpoint && include_endpoint)
DBUG_RETURN(1);
DBUG_RETURN(0);
}
}
if (unsigned_flag)
part_func_value-= 0x8000000000000000ULL;
if (left_endpoint && !include_endpoint)
part_func_value++;
/*
Search for the partition containing part_func_value
(including the right endpoint).
*/
while (max_part_id > min_part_id)
{
loc_part_id= (max_part_id + min_part_id) / 2;
if (range_array[loc_part_id] < part_func_value)
min_part_id= loc_part_id + 1;
else
max_part_id= loc_part_id;
}
loc_part_id= max_part_id;
/* Adjust for endpoints */
part_end_val= range_array[loc_part_id];
if (left_endpoint)
{
DBUG_ASSERT(part_func_value > part_end_val ?
(loc_part_id == max_partition &&
!part_info->defined_max_value) :
1);
/*
In case of PARTITION p VALUES LESS THAN MAXVALUE
the maximum value is in the current (last) partition.
If value is equal or greater than the endpoint,
the range starts from the next partition.
*/
if (part_func_value >= part_end_val &&
(loc_part_id < max_partition || !part_info->defined_max_value))
loc_part_id++;
}
else
{
/* if 'WHERE <= X' and partition is LESS THAN (X) include next partition */
if (include_endpoint && loc_part_id < max_partition &&
part_func_value == part_end_val)
loc_part_id++;
/* Right endpoint, set end after correct partition */
loc_part_id++;
}
DBUG_RETURN(loc_part_id);
}
int get_partition_id_hash_nosub(partition_info *part_info,
uint32 *part_id,
longlong *func_value)
{
return get_part_id_hash(part_info->num_parts, part_info->part_expr,
part_id, func_value);
}
int get_partition_id_linear_hash_nosub(partition_info *part_info,
uint32 *part_id,
longlong *func_value)
{
return get_part_id_linear_hash(part_info, part_info->num_parts,
part_info->part_expr, part_id, func_value);
}
int get_partition_id_key_nosub(partition_info *part_info,
uint32 *part_id,
longlong *func_value)
{
*part_id= get_part_id_key(part_info->table->file,
part_info->part_field_array,
part_info->num_parts, func_value);
return 0;
}
int get_partition_id_linear_key_nosub(partition_info *part_info,
uint32 *part_id,
longlong *func_value)
{
*part_id= get_part_id_linear_key(part_info,
part_info->part_field_array,
part_info->num_parts, func_value);
return 0;
}
int get_partition_id_with_sub(partition_info *part_info,
uint32 *part_id,
longlong *func_value)
{
uint32 loc_part_id, sub_part_id;
uint num_subparts;
int error;
DBUG_ENTER("get_partition_id_with_sub");
if (unlikely((error= part_info->get_part_partition_id(part_info,
&loc_part_id,
func_value))))
{
DBUG_RETURN(error);
}
num_subparts= part_info->num_subparts;
if (unlikely((error= part_info->get_subpartition_id(part_info,
&sub_part_id))))
{
DBUG_RETURN(error);
}
*part_id= get_part_id_for_sub(loc_part_id, sub_part_id, num_subparts);
DBUG_RETURN(0);
}
/*
This function is used to calculate the subpartition id
SYNOPSIS
get_subpartition_id()
part_info A reference to the partition_info struct where all the
desired information is given
RETURN VALUE
part_id The subpartition identity
DESCRIPTION
A routine used in some SELECT's when only partial knowledge of the
partitions is known.
It is actually 4 different variants of this function which are called
through a function pointer.
get_partition_id_hash_sub
get_partition_id_key_sub
get_partition_id_linear_hash_sub
get_partition_id_linear_key_sub
*/
int get_partition_id_hash_sub(partition_info *part_info,
uint32 *part_id)
{
longlong func_value;
return get_part_id_hash(part_info->num_subparts, part_info->subpart_expr,
part_id, &func_value);
}
int get_partition_id_linear_hash_sub(partition_info *part_info,
uint32 *part_id)
{
longlong func_value;
return get_part_id_linear_hash(part_info, part_info->num_subparts,
part_info->subpart_expr, part_id,
&func_value);
}
int get_partition_id_key_sub(partition_info *part_info,
uint32 *part_id)
{
longlong func_value;
*part_id= get_part_id_key(part_info->table->file,
part_info->subpart_field_array,
part_info->num_subparts, &func_value);
return FALSE;
}
int get_partition_id_linear_key_sub(partition_info *part_info,
uint32 *part_id)
{
longlong func_value;
*part_id= get_part_id_linear_key(part_info,
part_info->subpart_field_array,
part_info->num_subparts, &func_value);
return FALSE;
}
/*
Set an indicator on all partition fields that are set by the key
SYNOPSIS
set_PF_fields_in_key()
key_info Information about the index
key_length Length of key
RETURN VALUE
TRUE Found partition field set by key
FALSE No partition field set by key
*/
static bool set_PF_fields_in_key(KEY *key_info, uint key_length)
{
KEY_PART_INFO *key_part;
bool found_part_field= FALSE;
DBUG_ENTER("set_PF_fields_in_key");
for (key_part= key_info->key_part; (int)key_length > 0; key_part++)
{
if (key_part->null_bit)
key_length--;
if (key_part->type == HA_KEYTYPE_BIT)
{
if (((Field_bit*)key_part->field)->bit_len)
key_length--;
}
if (key_part->key_part_flag & (HA_BLOB_PART + HA_VAR_LENGTH_PART))
{
key_length-= HA_KEY_BLOB_LENGTH;
}
if (key_length < key_part->length)
break;
key_length-= key_part->length;
if (key_part->field->flags & FIELD_IN_PART_FUNC_FLAG)
{
found_part_field= TRUE;
key_part->field->flags|= GET_FIXED_FIELDS_FLAG;
}
}
DBUG_RETURN(found_part_field);
}
/*
We have found that at least one partition field was set by a key, now
check if a partition function has all its fields bound or not.
SYNOPSIS
check_part_func_bound()
ptr Array of fields NULL terminated (partition fields)
RETURN VALUE
TRUE All fields in partition function are set
FALSE Not all fields in partition function are set
*/
static bool check_part_func_bound(Field **ptr)
{
bool result= TRUE;
DBUG_ENTER("check_part_func_bound");
for (; *ptr; ptr++)
{
if (!((*ptr)->flags & GET_FIXED_FIELDS_FLAG))
{
result= FALSE;
break;
}
}
DBUG_RETURN(result);
}
/*
Get the id of the subpartitioning part by using the key buffer of the
index scan.
SYNOPSIS
get_sub_part_id_from_key()
table The table object
buf A buffer that can be used to evaluate the partition function
key_info The index object
key_spec A key_range containing key and key length
out:part_id The returned partition id
RETURN VALUES
TRUE All fields in partition function are set
FALSE Not all fields in partition function are set
DESCRIPTION
Use key buffer to set-up record in buf, move field pointers and
get the partition identity and restore field pointers afterwards.
*/
static int get_sub_part_id_from_key(const TABLE *table,uchar *buf,
KEY *key_info,
const key_range *key_spec,
uint32 *part_id)
{
uchar *rec0= table->record[0];
partition_info *part_info= table->part_info;
int res;
DBUG_ENTER("get_sub_part_id_from_key");
key_restore(buf, (uchar*)key_spec->key, key_info, key_spec->length);
if (likely(rec0 == buf))
{
res= part_info->get_subpartition_id(part_info, part_id);
}
else
{
Field **part_field_array= part_info->subpart_field_array;
part_info->table->move_fields(part_field_array, buf, rec0);
res= part_info->get_subpartition_id(part_info, part_id);
part_info->table->move_fields(part_field_array, rec0, buf);
}
DBUG_RETURN(res);
}
/*
Get the id of the partitioning part by using the key buffer of the
index scan.
SYNOPSIS
get_part_id_from_key()
table The table object
buf A buffer that can be used to evaluate the partition function
key_info The index object
key_spec A key_range containing key and key length
out:part_id Partition to use
RETURN VALUES
TRUE Partition to use not found
FALSE Ok, part_id indicates partition to use
DESCRIPTION
Use key buffer to set-up record in buf, move field pointers and
get the partition identity and restore field pointers afterwards.
*/
bool get_part_id_from_key(const TABLE *table, uchar *buf, KEY *key_info,
const key_range *key_spec, uint32 *part_id)
{
bool result;
uchar *rec0= table->record[0];
partition_info *part_info= table->part_info;
longlong func_value;
DBUG_ENTER("get_part_id_from_key");
key_restore(buf, (uchar*)key_spec->key, key_info, key_spec->length);
if (likely(rec0 == buf))
{
result= part_info->get_part_partition_id(part_info, part_id,
&func_value);
}
else
{
Field **part_field_array= part_info->part_field_array;
part_info->table->move_fields(part_field_array, buf, rec0);
result= part_info->get_part_partition_id(part_info, part_id,
&func_value);
part_info->table->move_fields(part_field_array, rec0, buf);
}
DBUG_RETURN(result);
}
/*
Get the partitioning id of the full PF by using the key buffer of the
index scan.
SYNOPSIS
get_full_part_id_from_key()
table The table object
buf A buffer that is used to evaluate the partition function
key_info The index object
key_spec A key_range containing key and key length
out:part_spec A partition id containing start part and end part
RETURN VALUES
part_spec
No partitions to scan is indicated by end_part > start_part when returning
DESCRIPTION
Use key buffer to set-up record in buf, move field pointers if needed and
get the partition identity and restore field pointers afterwards.
*/
void get_full_part_id_from_key(const TABLE *table, uchar *buf,
KEY *key_info,
const key_range *key_spec,
part_id_range *part_spec)
{
bool result;
partition_info *part_info= table->part_info;
uchar *rec0= table->record[0];
longlong func_value;
DBUG_ENTER("get_full_part_id_from_key");
key_restore(buf, (uchar*)key_spec->key, key_info, key_spec->length);
if (likely(rec0 == buf))
{
result= part_info->get_partition_id(part_info, &part_spec->start_part,
&func_value);
}
else
{
Field **part_field_array= part_info->full_part_field_array;
part_info->table->move_fields(part_field_array, buf, rec0);
result= part_info->get_partition_id(part_info, &part_spec->start_part,
&func_value);
part_info->table->move_fields(part_field_array, rec0, buf);
}
part_spec->end_part= part_spec->start_part;
if (unlikely(result))
part_spec->start_part++;
DBUG_VOID_RETURN;
}
/**
@brief Verify that all rows in a table is in the given partition
@param table Table which contains the data that will be checked if
it is matching the partition definition.
@param part_table Partitioned table containing the partition to check.
@param part_id Which partition to match with.
@return Operation status
@retval TRUE Not all rows match the given partition
@retval FALSE OK
*/
bool verify_data_with_partition(TABLE *table, TABLE *part_table,
uint32 part_id)
{
uint32 found_part_id;
longlong func_value; /* Unused */
handler *file;
int error;
uchar *old_rec;
partition_info *part_info;
DBUG_ENTER("verify_data_with_partition");
DBUG_ASSERT(table && table->file && part_table && part_table->part_info &&
part_table->file);
/*
Verify all table rows.
First implementation uses full scan + evaluates partition functions for
every row. TODO: add optimization to use index if possible, see WL#5397.
1) Open both tables (already done) and set the row buffers to use
the same buffer (to avoid copy).
2) Init rnd on table.
3) loop over all rows.
3.1) verify that partition_id on the row is correct. Break if error.
*/
file= table->file;
part_info= part_table->part_info;
bitmap_union(table->read_set, &part_info->full_part_field_set);
old_rec= part_table->record[0];
part_table->record[0]= table->record[0];
part_info->table->move_fields(part_info->full_part_field_array, table->record[0], old_rec);
if ((error= file->ha_rnd_init(TRUE)))
{
file->print_error(error, MYF(0));
goto err;
}
do
{
if ((error= file->ha_rnd_next(table->record[0])))
{
if (error == HA_ERR_RECORD_DELETED)
continue;
if (error == HA_ERR_END_OF_FILE)
error= 0;
else
file->print_error(error, MYF(0));
break;
}
if ((error= part_info->get_partition_id(part_info, &found_part_id,
&func_value)))
{
part_table->file->print_error(error, MYF(0));
break;
}
DEBUG_SYNC(current_thd, "swap_partition_first_row_read");
if (found_part_id != part_id)
{
my_error(ER_ROW_DOES_NOT_MATCH_PARTITION, MYF(0));
error= 1;
break;
}
} while (TRUE);
(void) file->ha_rnd_end();
err:
part_info->table->move_fields(part_info->full_part_field_array, old_rec,
table->record[0]);
part_table->record[0]= old_rec;
if (error)
DBUG_RETURN(TRUE);
DBUG_RETURN(FALSE);
}
/*
Prune the set of partitions to use in query
SYNOPSIS
prune_partition_set()
table The table object
out:part_spec Contains start part, end part
DESCRIPTION
This function is called to prune the range of partitions to scan by
checking the read_partitions bitmap.
If start_part > end_part at return it means no partition needs to be
scanned. If start_part == end_part it always means a single partition
needs to be scanned.
RETURN VALUE
part_spec
*/
void prune_partition_set(const TABLE *table, part_id_range *part_spec)
{
int last_partition= -1;
uint i;
partition_info *part_info= table->part_info;
DBUG_ENTER("prune_partition_set");
for (i= part_spec->start_part; i <= part_spec->end_part; i++)
{
if (bitmap_is_set(&(part_info->read_partitions), i))
{
DBUG_PRINT("info", ("Partition %d is set", i));
if (last_partition == -1)
/* First partition found in set and pruned bitmap */
part_spec->start_part= i;
last_partition= i;
}
}
if (last_partition == -1)
/* No partition found in pruned bitmap */
part_spec->start_part= part_spec->end_part + 1;
else //if (last_partition != -1)
part_spec->end_part= last_partition;
DBUG_VOID_RETURN;
}
/*
Get the set of partitions to use in query.
SYNOPSIS
get_partition_set()
table The table object
buf A buffer that can be used to evaluate the partition function
index The index of the key used, if MAX_KEY no index used
key_spec A key_range containing key and key length
out:part_spec Contains start part, end part and indicator if bitmap is
used for which partitions to scan
DESCRIPTION
This function is called to discover which partitions to use in an index
scan or a full table scan.
It returns a range of partitions to scan. If there are holes in this
range with partitions that are not needed to scan a bit array is used
to signal which partitions to use and which not to use.
If start_part > end_part at return it means no partition needs to be
scanned. If start_part == end_part it always means a single partition
needs to be scanned.
RETURN VALUE
part_spec
*/
void get_partition_set(const TABLE *table, uchar *buf, const uint index,
const key_range *key_spec, part_id_range *part_spec)
{
partition_info *part_info= table->part_info;
uint num_parts= part_info->get_tot_partitions();
uint i, part_id;
uint sub_part= num_parts;
uint32 part_part= num_parts;
KEY *key_info= NULL;
bool found_part_field= FALSE;
DBUG_ENTER("get_partition_set");
part_spec->start_part= 0;
part_spec->end_part= num_parts - 1;
if ((index < MAX_KEY) &&
key_spec && key_spec->flag == (uint)HA_READ_KEY_EXACT &&
part_info->some_fields_in_PF.is_set(index))
{
key_info= table->key_info+index;
/*
The index can potentially provide at least one PF-field (field in the
partition function). Thus it is interesting to continue our probe.
*/
if (key_spec->length == key_info->key_length)
{
/*
The entire key is set so we can check whether we can immediately
derive either the complete PF or if we can derive either
the top PF or the subpartitioning PF. This can be established by
checking precalculated bits on each index.
*/
if (part_info->all_fields_in_PF.is_set(index))
{
/*
We can derive the exact partition to use, no more than this one
is needed.
*/
get_full_part_id_from_key(table,buf,key_info,key_spec,part_spec);
/*
Check if range can be adjusted by looking in read_partitions
*/
prune_partition_set(table, part_spec);
DBUG_VOID_RETURN;
}
else if (part_info->is_sub_partitioned())
{
if (part_info->all_fields_in_SPF.is_set(index))
{
if (get_sub_part_id_from_key(table, buf, key_info, key_spec, &sub_part))
{
part_spec->start_part= num_parts;
DBUG_VOID_RETURN;
}
}
else if (part_info->all_fields_in_PPF.is_set(index))
{
if (get_part_id_from_key(table,buf,key_info,
key_spec,(uint32*)&part_part))
{
/*
The value of the RANGE or LIST partitioning was outside of
allowed values. Thus it is certain that the result of this
scan will be empty.
*/
part_spec->start_part= num_parts;
DBUG_VOID_RETURN;
}
}
}
}
else
{
/*
Set an indicator on all partition fields that are bound.
If at least one PF-field was bound it pays off to check whether
the PF or PPF or SPF has been bound.
(PF = Partition Function, SPF = Subpartition Function and
PPF = Partition Function part of subpartitioning)
*/
if ((found_part_field= set_PF_fields_in_key(key_info,
key_spec->length)))
{
if (check_part_func_bound(part_info->full_part_field_array))
{
/*
We were able to bind all fields in the partition function even
by using only a part of the key. Calculate the partition to use.
*/
get_full_part_id_from_key(table,buf,key_info,key_spec,part_spec);
clear_indicator_in_key_fields(key_info);
/*
Check if range can be adjusted by looking in read_partitions
*/
prune_partition_set(table, part_spec);
DBUG_VOID_RETURN;
}
else if (part_info->is_sub_partitioned())
{
if (check_part_func_bound(part_info->subpart_field_array))
{
if (get_sub_part_id_from_key(table, buf, key_info, key_spec, &sub_part))
{
part_spec->start_part= num_parts;
clear_indicator_in_key_fields(key_info);
DBUG_VOID_RETURN;
}
}
else if (check_part_func_bound(part_info->part_field_array))
{
if (get_part_id_from_key(table,buf,key_info,key_spec,&part_part))
{
part_spec->start_part= num_parts;
clear_indicator_in_key_fields(key_info);
DBUG_VOID_RETURN;
}
}
}
}
}
}
{
/*
The next step is to analyse the table condition to see whether any
information about which partitions to scan can be derived from there.
Currently not implemented.
*/
}
/*
If we come here we have found a range of sorts we have either discovered
nothing or we have discovered a range of partitions with possible holes
in it. We need a bitvector to further the work here.
*/
if (!(part_part == num_parts && sub_part == num_parts))
{
/*
We can only arrive here if we are using subpartitioning.
*/
if (part_part != num_parts)
{
/*
We know the top partition and need to scan all underlying
subpartitions. This is a range without holes.
*/
DBUG_ASSERT(sub_part == num_parts);
part_spec->start_part= part_part * part_info->num_subparts;
part_spec->end_part= part_spec->start_part+part_info->num_subparts - 1;
}
else
{
DBUG_ASSERT(sub_part != num_parts);
part_spec->start_part= sub_part;
part_spec->end_part=sub_part+
(part_info->num_subparts*(part_info->num_parts-1));
for (i= 0, part_id= sub_part; i < part_info->num_parts;
i++, part_id+= part_info->num_subparts)
; //Set bit part_id in bit array
}
}
if (found_part_field)
clear_indicator_in_key_fields(key_info);
/*
Check if range can be adjusted by looking in read_partitions
*/
prune_partition_set(table, part_spec);
DBUG_VOID_RETURN;
}
/*
If the table is partitioned we will read the partition info into the
.frm file here.
-------------------------------
| Fileinfo 64 bytes |
-------------------------------
| Formnames 7 bytes |
-------------------------------
| Not used 4021 bytes |
-------------------------------
| Keyinfo + record |
-------------------------------
| Padded to next multiple |
| of IO_SIZE |
-------------------------------
| Forminfo 288 bytes |
-------------------------------
| Screen buffer, to make |
|field names readable |
-------------------------------
| Packed field info |
|17 + 1 + strlen(field_name) |
| + 1 end of file character |
-------------------------------
| Partition info |
-------------------------------
We provide the length of partition length in Fileinfo[55-58].
Read the partition syntax from the frm file and parse it to get the
data structures of the partitioning.
SYNOPSIS
mysql_unpack_partition()
thd Thread object
part_buf Partition info from frm file
part_info_len Length of partition syntax
table Table object of partitioned table
create_table_ind Is it called from CREATE TABLE
default_db_type What is the default engine of the table
work_part_info_used Flag is raised if we don't create new
part_info, but used thd->work_part_info
RETURN VALUE
TRUE Error
FALSE Sucess
DESCRIPTION
Read the partition syntax from the current position in the frm file.
Initiate a LEX object, save the list of item tree objects to free after
the query is done. Set-up partition info object such that parser knows
it is called from internally. Call parser to create data structures
(best possible recreation of item trees and so forth since there is no
serialisation of these objects other than in parseable text format).
We need to save the text of the partition functions since it is not
possible to retrace this given an item tree.
*/
bool mysql_unpack_partition(THD *thd,
char *part_buf, uint part_info_len,
TABLE* table, bool is_create_table_ind,
handlerton *default_db_type,
bool *work_part_info_used)
{
bool result= TRUE;
partition_info *part_info;
CHARSET_INFO *old_character_set_client=
thd->variables.character_set_client;
LEX *old_lex= thd->lex;
LEX lex;
PSI_statement_locker *parent_locker= thd->m_statement_psi;
DBUG_ENTER("mysql_unpack_partition");
thd->variables.character_set_client= system_charset_info;
Parser_state parser_state;
if (parser_state.init(thd, part_buf, part_info_len))
goto end;
if (init_lex_with_single_table(thd, table, &lex))
goto end;
/*
All Items created is put into a free list on the THD object. This list
is used to free all Item objects after completing a query. We don't
want that to happen with the Item tree created as part of the partition
info. This should be attached to the table object and remain so until
the table object is released.
Thus we move away the current list temporarily and start a new list that
we then save in the partition info structure.
*/
*work_part_info_used= FALSE;
lex.part_info= new partition_info();/* Indicates MYSQLparse from this place */
if (!lex.part_info)
{
mem_alloc_error(sizeof(partition_info));
goto end;
}
part_info= lex.part_info;
DBUG_PRINT("info", ("Parse: %s", part_buf));
thd->m_statement_psi= NULL;
if (parse_sql(thd, & parser_state, NULL) ||
part_info->fix_parser_data(thd))
{
thd->free_items();
thd->m_statement_psi= parent_locker;
goto end;
}
thd->m_statement_psi= parent_locker;
/*
The parsed syntax residing in the frm file can still contain defaults.
The reason is that the frm file is sometimes saved outside of this
MySQL Server and used in backup and restore of clusters or partitioned
tables. It is not certain that the restore will restore exactly the
same default partitioning.
The easiest manner of handling this is to simply continue using the
part_info we already built up during mysql_create_table if we are
in the process of creating a table. If the table already exists we
need to discover the number of partitions for the default parts. Since
the handler object hasn't been created here yet we need to postpone this
to the fix_partition_func method.
*/
DBUG_PRINT("info", ("Successful parse"));
DBUG_PRINT("info", ("default engine = %s, default_db_type = %s",
ha_resolve_storage_engine_name(part_info->default_engine_type),
ha_resolve_storage_engine_name(default_db_type)));
if (is_create_table_ind && old_lex->sql_command == SQLCOM_CREATE_TABLE)
{
/*
When we come here we are doing a create table. In this case we
have already done some preparatory work on the old part_info
object. We don't really need this new partition_info object.
Thus we go back to the old partition info object.
We need to free any memory objects allocated on item_free_list
by the parser since we are keeping the old info from the first
parser call in CREATE TABLE.
This table object can not be used any more. However, since
this is CREATE TABLE, we know that it will be destroyed by the
caller, and rely on that.
*/
thd->free_items();
part_info= thd->work_part_info;
*work_part_info_used= true;
}
table->part_info= part_info;
part_info->table= table;
table->file->set_part_info(part_info);
if (!part_info->default_engine_type)
part_info->default_engine_type= default_db_type;
DBUG_ASSERT(part_info->default_engine_type == default_db_type);
DBUG_ASSERT(part_info->default_engine_type->db_type != DB_TYPE_UNKNOWN);
DBUG_ASSERT(part_info->default_engine_type != partition_hton);
{
/*
This code part allocates memory for the serialised item information for
the partition functions. In most cases this is not needed but if the
table is used for SHOW CREATE TABLES or ALTER TABLE that modifies
partition information it is needed and the info is lost if we don't
save it here so unfortunately we have to do it here even if in most
cases it is not needed. This is a consequence of that item trees are
not serialisable.
*/
uint part_func_len= part_info->part_func_len;
uint subpart_func_len= part_info->subpart_func_len;
char *part_func_string= NULL;
char *subpart_func_string= NULL;
if ((part_func_len &&
!((part_func_string= (char*) thd->alloc(part_func_len)))) ||
(subpart_func_len &&
!((subpart_func_string= (char*) thd->alloc(subpart_func_len)))))
{
mem_alloc_error(part_func_len);
thd->free_items();
goto end;
}
if (part_func_len)
memcpy(part_func_string, part_info->part_func_string, part_func_len);
if (subpart_func_len)
memcpy(subpart_func_string, part_info->subpart_func_string,
subpart_func_len);
part_info->part_func_string= part_func_string;
part_info->subpart_func_string= subpart_func_string;
}
result= FALSE;
end:
end_lex_with_single_table(thd, table, old_lex);
thd->variables.character_set_client= old_character_set_client;
DBUG_RETURN(result);
}
/*
Set engine type on all partition element objects
SYNOPSIS
set_engine_all_partitions()
part_info Partition info
engine_type Handlerton reference of engine
RETURN VALUES
NONE
*/
static
void
set_engine_all_partitions(partition_info *part_info,
handlerton *engine_type)
{
uint i= 0;
List_iterator<partition_element> part_it(part_info->partitions);
do
{
partition_element *part_elem= part_it++;
part_elem->engine_type= engine_type;
if (part_info->is_sub_partitioned())
{
List_iterator<partition_element> sub_it(part_elem->subpartitions);
uint j= 0;
do
{
partition_element *sub_elem= sub_it++;
sub_elem->engine_type= engine_type;
} while (++j < part_info->num_subparts);
}
} while (++i < part_info->num_parts);
}
/**
Support routine to handle the successful cases for partition management.
@param thd Thread object
@param copied Number of records copied
@param deleted Number of records deleted
@param table_list Table list with the one table in it
@return Operation status
@retval FALSE Success
@retval TRUE Failure
*/
static int fast_end_partition(THD *thd, ulonglong copied,
ulonglong deleted,
TABLE_LIST *table_list)
{
char tmp_name[80];
DBUG_ENTER("fast_end_partition");
thd->proc_info="end";
query_cache_invalidate3(thd, table_list, 0);
my_snprintf(tmp_name, sizeof(tmp_name), ER_THD(thd, ER_INSERT_INFO),
(ulong) (copied + deleted),
(ulong) deleted,
(ulong) 0);
my_ok(thd, (ha_rows) (copied+deleted),0L, tmp_name);
DBUG_RETURN(FALSE);
}
/*
We need to check if engine used by all partitions can handle
partitioning natively.
SYNOPSIS
check_native_partitioned()
create_info Create info in CREATE TABLE
out:ret_val Return value
part_info Partition info
thd Thread object
RETURN VALUES
Value returned in bool ret_value
TRUE Native partitioning supported by engine
FALSE Need to use partition handler
Return value from function
TRUE Error
FALSE Success
*/
static bool check_native_partitioned(HA_CREATE_INFO *create_info,bool *ret_val,
partition_info *part_info, THD *thd)
{
bool table_engine_set;
handlerton *engine_type= part_info->default_engine_type;
handlerton *old_engine_type= engine_type;
DBUG_ENTER("check_native_partitioned");
if (create_info->used_fields & HA_CREATE_USED_ENGINE)
{
table_engine_set= TRUE;
engine_type= create_info->db_type;
}
else
{
table_engine_set= FALSE;
if (thd->lex->sql_command != SQLCOM_CREATE_TABLE)
{
table_engine_set= TRUE;
DBUG_ASSERT(engine_type && engine_type != partition_hton);
}
}
DBUG_PRINT("info", ("engine_type = %s, table_engine_set = %u",
ha_resolve_storage_engine_name(engine_type),
table_engine_set));
if (part_info->check_engine_mix(engine_type, table_engine_set))
goto error;
/*
All engines are of the same type. Check if this engine supports
native partitioning.
*/
if (!engine_type)
engine_type= old_engine_type;
DBUG_PRINT("info", ("engine_type = %s",
ha_resolve_storage_engine_name(engine_type)));
if (engine_type->partition_flags &&
(engine_type->partition_flags() & HA_CAN_PARTITION))
{
create_info->db_type= engine_type;
DBUG_PRINT("info", ("Changed to native partitioning"));
*ret_val= TRUE;
}
DBUG_RETURN(FALSE);
error:
/*
Mixed engines not yet supported but when supported it will need
the partition handler
*/
my_error(ER_MIX_HANDLER_ERROR, MYF(0));
*ret_val= FALSE;
DBUG_RETURN(TRUE);
}
/**
Sets which partitions to be used in the command.
@param alter_info Alter_info pointer holding partition names and flags.
@param tab_part_info partition_info holding all partitions.
@param part_state Which state to set for the named partitions.
@return Operation status
@retval false Success
@retval true Failure
*/
bool set_part_state(Alter_info *alter_info, partition_info *tab_part_info,
enum partition_state part_state)
{
uint part_count= 0;
uint num_parts_found= 0;
List_iterator<partition_element> part_it(tab_part_info->partitions);
do
{
partition_element *part_elem= part_it++;
if ((alter_info->flags & Alter_info::ALTER_ALL_PARTITION) ||
(is_name_in_list(part_elem->partition_name,
alter_info->partition_names)))
{
/*
Mark the partition.
I.e mark the partition as a partition to be "changed" by
analyzing/optimizing/rebuilding/checking/repairing/...
*/
num_parts_found++;
part_elem->part_state= part_state;
DBUG_PRINT("info", ("Setting part_state to %u for partition %s",
part_state, part_elem->partition_name));
}
else
part_elem->part_state= PART_NORMAL;
} while (++part_count < tab_part_info->num_parts);
if (num_parts_found != alter_info->partition_names.elements &&
!(alter_info->flags & Alter_info::ALTER_ALL_PARTITION))
{
/* Not all given partitions found, revert and return failure */
part_it.rewind();
part_count= 0;
do
{
partition_element *part_elem= part_it++;
part_elem->part_state= PART_NORMAL;
} while (++part_count < tab_part_info->num_parts);
return true;
}
return false;
}
/**
@brief Check if partition is exchangable with table by checking table options
@param table_create_info Table options from table.
@param part_elem All the info of the partition.
@retval FALSE if they are equal, otherwise TRUE.
@note Any differens that would cause a change in the frm file is prohibited.
Such options as data_file_name, index_file_name, min_rows, max_rows etc. are
not allowed to differ. But comment is allowed to differ.
*/
bool compare_partition_options(HA_CREATE_INFO *table_create_info,
partition_element *part_elem)
{
#define MAX_COMPARE_PARTITION_OPTION_ERRORS 5
const char *option_diffs[MAX_COMPARE_PARTITION_OPTION_ERRORS + 1];
int i, errors= 0;
DBUG_ENTER("compare_partition_options");
DBUG_ASSERT(!part_elem->tablespace_name &&
!table_create_info->tablespace);
/*
Note that there are not yet any engine supporting tablespace together
with partitioning. TODO: when there are, add compare.
*/
if (part_elem->tablespace_name || table_create_info->tablespace)
option_diffs[errors++]= "TABLESPACE";
if (part_elem->part_max_rows != table_create_info->max_rows)
option_diffs[errors++]= "MAX_ROWS";
if (part_elem->part_min_rows != table_create_info->min_rows)
option_diffs[errors++]= "MIN_ROWS";
if (part_elem->data_file_name || table_create_info->data_file_name)
option_diffs[errors++]= "DATA DIRECTORY";
if (part_elem->index_file_name || table_create_info->index_file_name)
option_diffs[errors++]= "INDEX DIRECTORY";
for (i= 0; i < errors; i++)
my_error(ER_PARTITION_EXCHANGE_DIFFERENT_OPTION, MYF(0),
option_diffs[i]);
DBUG_RETURN(errors != 0);
}
/*
Prepare for ALTER TABLE of partition structure
@param[in] thd Thread object
@param[in] table Table object
@param[in,out] alter_info Alter information
@param[in,out] create_info Create info for CREATE TABLE
@param[in] alter_ctx ALTER TABLE runtime context
@param[out] partition_changed Boolean indicating whether partition changed
@param[out] fast_alter_table Boolean indicating if fast partition alter is
possible.
@return Operation status
@retval TRUE Error
@retval FALSE Success
@note
This method handles all preparations for ALTER TABLE for partitioned
tables.
We need to handle both partition management command such as Add Partition
and others here as well as an ALTER TABLE that completely changes the
partitioning and yet others that don't change anything at all. We start
by checking the partition management variants and then check the general
change patterns.
*/
uint prep_alter_part_table(THD *thd, TABLE *table, Alter_info *alter_info,
HA_CREATE_INFO *create_info,
Alter_table_ctx *alter_ctx,
bool *partition_changed,
bool *fast_alter_table)
{
DBUG_ENTER("prep_alter_part_table");
/* Foreign keys on partitioned tables are not supported, waits for WL#148 */
if (table->part_info && (alter_info->flags & Alter_info::ADD_FOREIGN_KEY ||
alter_info->flags & Alter_info::DROP_FOREIGN_KEY))
{
my_error(ER_FOREIGN_KEY_ON_PARTITIONED, MYF(0));
DBUG_RETURN(TRUE);
}
/* Remove partitioning on a not partitioned table is not possible */
if (!table->part_info && (alter_info->flags &
Alter_info::ALTER_REMOVE_PARTITIONING))
{
my_error(ER_PARTITION_MGMT_ON_NONPARTITIONED, MYF(0));
DBUG_RETURN(TRUE);
}
partition_info *alt_part_info= thd->lex->part_info;
/*
This variable is TRUE in very special case when we add only DEFAULT
partition to the existing table
*/
bool only_default_value_added=
(alt_part_info &&
alt_part_info->current_partition &&
alt_part_info->current_partition->list_val_list.elements == 1 &&
alt_part_info->current_partition->list_val_list.head()->
added_items >= 1 &&
alt_part_info->current_partition->list_val_list.head()->
col_val_array[0].max_value) &&
alt_part_info->part_type == LIST_PARTITION &&
(alter_info->flags & Alter_info::ALTER_ADD_PARTITION);
if (only_default_value_added &&
!thd->lex->part_info->num_columns)
thd->lex->part_info->num_columns= 1; // to make correct clone
if ((thd->work_part_info= thd->lex->part_info) &&
!(thd->work_part_info= thd->lex->part_info->get_clone(thd)))
DBUG_RETURN(TRUE);
/* ALTER_ADMIN_PARTITION is handled in mysql_admin_table */
DBUG_ASSERT(!(alter_info->flags & Alter_info::ALTER_ADMIN_PARTITION));
if (alter_info->flags &
(Alter_info::ALTER_ADD_PARTITION |
Alter_info::ALTER_DROP_PARTITION |
Alter_info::ALTER_COALESCE_PARTITION |
Alter_info::ALTER_REORGANIZE_PARTITION |
Alter_info::ALTER_TABLE_REORG |
Alter_info::ALTER_REBUILD_PARTITION))
{
partition_info *tab_part_info;
uint flags= 0;
bool is_last_partition_reorged= FALSE;
part_elem_value *tab_max_elem_val= NULL;
part_elem_value *alt_max_elem_val= NULL;
longlong tab_max_range= 0, alt_max_range= 0;
alt_part_info= thd->work_part_info;
if (!table->part_info)
{
my_error(ER_PARTITION_MGMT_ON_NONPARTITIONED, MYF(0));
DBUG_RETURN(TRUE);
}
/*
Open our intermediate table, we will operate on a temporary instance
of the original table, to be able to skip copying all partitions.
Open it as a copy of the original table, and modify its partition_info
object to allow fast_alter_partition_table to perform the changes.
*/
DBUG_ASSERT(thd->mdl_context.is_lock_owner(MDL_key::TABLE,
alter_ctx->db,
alter_ctx->table_name,
MDL_INTENTION_EXCLUSIVE));
tab_part_info= table->part_info;
if (alter_info->flags & Alter_info::ALTER_TABLE_REORG)
{
uint new_part_no, curr_part_no;
/*
'ALTER TABLE t REORG PARTITION' only allowed with auto partition
if default partitioning is used.
*/
if (tab_part_info->part_type != HASH_PARTITION ||
((table->s->db_type()->partition_flags() & HA_USE_AUTO_PARTITION) &&
!tab_part_info->use_default_num_partitions) ||
((!(table->s->db_type()->partition_flags() & HA_USE_AUTO_PARTITION)) &&
tab_part_info->use_default_num_partitions))
{
my_error(ER_REORG_NO_PARAM_ERROR, MYF(0));
goto err;
}
new_part_no= table->file->get_default_no_partitions(create_info);
curr_part_no= tab_part_info->num_parts;
if (new_part_no == curr_part_no)
{
/*
No change is needed, we will have the same number of partitions
after the change as before. Thus we can reply ok immediately
without any changes at all.
*/
flags= table->file->alter_table_flags(alter_info->flags);
if (flags & (HA_FAST_CHANGE_PARTITION | HA_PARTITION_ONE_PHASE))
{
*fast_alter_table= true;
/* Force table re-open for consistency with the main case. */
table->m_needs_reopen= true;
}
else
{
/*
Create copy of partition_info to avoid modifying original
TABLE::part_info, to keep it safe for later use.
*/
if (!(tab_part_info= tab_part_info->get_clone(thd)))
DBUG_RETURN(TRUE);
}
thd->work_part_info= tab_part_info;
DBUG_RETURN(FALSE);
}
else if (new_part_no > curr_part_no)
{
/*
We will add more partitions, we use the ADD PARTITION without
setting the flag for no default number of partitions
*/
alter_info->flags|= Alter_info::ALTER_ADD_PARTITION;
thd->work_part_info->num_parts= new_part_no - curr_part_no;
}
else
{
/*
We will remove hash partitions, we use the COALESCE PARTITION
without setting the flag for no default number of partitions
*/
alter_info->flags|= Alter_info::ALTER_COALESCE_PARTITION;
alter_info->num_parts= curr_part_no - new_part_no;
}
}
if (!(flags= table->file->alter_table_flags(alter_info->flags)))
{
my_error(ER_PARTITION_FUNCTION_FAILURE, MYF(0));
goto err;
}
if ((flags & (HA_FAST_CHANGE_PARTITION | HA_PARTITION_ONE_PHASE)) != 0)
{
/*
"Fast" change of partitioning is supported in this case.
We will change TABLE::part_info (as this is how we pass
information to storage engine in this case), so the table
must be reopened.
*/
*fast_alter_table= true;
table->m_needs_reopen= true;
}
else
{
/*
"Fast" changing of partitioning is not supported. Create
a copy of TABLE::part_info object, so we can modify it safely.
Modifying original TABLE::part_info will cause problems when
we read data from old version of table using this TABLE object
while copying them to new version of table.
*/
if (!(tab_part_info= tab_part_info->get_clone(thd)))
DBUG_RETURN(TRUE);
}
DBUG_PRINT("info", ("*fast_alter_table flags: 0x%x", flags));
if ((alter_info->flags & Alter_info::ALTER_ADD_PARTITION) ||
(alter_info->flags & Alter_info::ALTER_REORGANIZE_PARTITION))
{
if (thd->work_part_info->part_type != tab_part_info->part_type)
{
if (thd->work_part_info->part_type == NOT_A_PARTITION)
{
if (tab_part_info->part_type == RANGE_PARTITION)
{
my_error(ER_PARTITIONS_MUST_BE_DEFINED_ERROR, MYF(0), "RANGE");
goto err;
}
else if (tab_part_info->part_type == LIST_PARTITION)
{
my_error(ER_PARTITIONS_MUST_BE_DEFINED_ERROR, MYF(0), "LIST");
goto err;
}
/*
Hash partitions can be altered without parser finds out about
that it is HASH partitioned. So no error here.
*/
}
else
{
if (thd->work_part_info->part_type == RANGE_PARTITION)
{
my_error(ER_PARTITION_WRONG_VALUES_ERROR, MYF(0),
"RANGE", "LESS THAN");
}
else if (thd->work_part_info->part_type == LIST_PARTITION)
{
DBUG_ASSERT(thd->work_part_info->part_type == LIST_PARTITION);
my_error(ER_PARTITION_WRONG_VALUES_ERROR, MYF(0),
"LIST", "IN");
}
else if (tab_part_info->part_type == RANGE_PARTITION)
{
my_error(ER_PARTITION_REQUIRES_VALUES_ERROR, MYF(0),
"RANGE", "LESS THAN");
}
else
{
DBUG_ASSERT(tab_part_info->part_type == LIST_PARTITION);
my_error(ER_PARTITION_REQUIRES_VALUES_ERROR, MYF(0),
"LIST", "IN");
}
goto err;
}
}
if ((tab_part_info->column_list &&
alt_part_info->num_columns != tab_part_info->num_columns &&
!only_default_value_added) ||
(!tab_part_info->column_list &&
(tab_part_info->part_type == RANGE_PARTITION ||
tab_part_info->part_type == LIST_PARTITION) &&
alt_part_info->num_columns != 1U &&
!only_default_value_added) ||
(!tab_part_info->column_list &&
tab_part_info->part_type == HASH_PARTITION &&
(alt_part_info->num_columns != 0)))
{
my_error(ER_PARTITION_COLUMN_LIST_ERROR, MYF(0));
goto err;
}
alt_part_info->column_list= tab_part_info->column_list;
if (alt_part_info->fix_parser_data(thd))
{
goto err;
}
}
if (alter_info->flags & Alter_info::ALTER_ADD_PARTITION)
{
/*
We start by moving the new partitions to the list of temporary
partitions. We will then check that the new partitions fit in the
partitioning scheme as currently set-up.
Partitions are always added at the end in ADD PARTITION.
*/
uint num_new_partitions= alt_part_info->num_parts;
uint num_orig_partitions= tab_part_info->num_parts;
uint check_total_partitions= num_new_partitions + num_orig_partitions;
uint new_total_partitions= check_total_partitions;
/*
We allow quite a lot of values to be supplied by defaults, however we
must know the number of new partitions in this case.
*/
if (thd->lex->no_write_to_binlog &&
tab_part_info->part_type != HASH_PARTITION)
{
my_error(ER_NO_BINLOG_ERROR, MYF(0));
goto err;
}
if (tab_part_info->defined_max_value &&
(tab_part_info->part_type == RANGE_PARTITION ||
alt_part_info->defined_max_value))
{
my_error((tab_part_info->part_type == RANGE_PARTITION ?
ER_PARTITION_MAXVALUE_ERROR :
ER_PARTITION_DEFAULT_ERROR), MYF(0));
goto err;
}
if (num_new_partitions == 0)
{
my_error(ER_ADD_PARTITION_NO_NEW_PARTITION, MYF(0));
goto err;
}
if (tab_part_info->is_sub_partitioned())
{
if (alt_part_info->num_subparts == 0)
alt_part_info->num_subparts= tab_part_info->num_subparts;
else if (alt_part_info->num_subparts != tab_part_info->num_subparts)
{
my_error(ER_ADD_PARTITION_SUBPART_ERROR, MYF(0));
goto err;
}
check_total_partitions= new_total_partitions*
alt_part_info->num_subparts;
}
if (check_total_partitions > MAX_PARTITIONS)
{
my_error(ER_TOO_MANY_PARTITIONS_ERROR, MYF(0));
goto err;
}
alt_part_info->part_type= tab_part_info->part_type;
alt_part_info->subpart_type= tab_part_info->subpart_type;
if (alt_part_info->set_up_defaults_for_partitioning(thd, table->file, 0,
tab_part_info->num_parts))
{
goto err;
}
/*
Handling of on-line cases:
ADD PARTITION for RANGE/LIST PARTITIONING:
------------------------------------------
For range and list partitions add partition is simply adding a
new empty partition to the table. If the handler support this we
will use the simple method of doing this. The figure below shows
an example of this and the states involved in making this change.
Existing partitions New added partitions
------ ------ ------ ------ | ------ ------
| | | | | | | | | | | | |
| p0 | | p1 | | p2 | | p3 | | | p4 | | p5 |
------ ------ ------ ------ | ------ ------
PART_NORMAL PART_NORMAL PART_NORMAL PART_NORMAL PART_TO_BE_ADDED*2
PART_NORMAL PART_NORMAL PART_NORMAL PART_NORMAL PART_IS_ADDED*2
The first line is the states before adding the new partitions and the
second line is after the new partitions are added. All the partitions are
in the partitions list, no partitions are placed in the temp_partitions
list.
ADD PARTITION for HASH PARTITIONING
-----------------------------------
This little figure tries to show the various partitions involved when
adding two new partitions to a linear hash based partitioned table with
four partitions to start with, which lists are used and the states they
pass through. Adding partitions to a normal hash based is similar except
that it is always all the existing partitions that are reorganised not
only a subset of them.
Existing partitions New added partitions
------ ------ ------ ------ | ------ ------
| | | | | | | | | | | | |
| p0 | | p1 | | p2 | | p3 | | | p4 | | p5 |
------ ------ ------ ------ | ------ ------
PART_CHANGED PART_CHANGED PART_NORMAL PART_NORMAL PART_TO_BE_ADDED
PART_IS_CHANGED*2 PART_NORMAL PART_NORMAL PART_IS_ADDED
PART_NORMAL PART_NORMAL PART_NORMAL PART_NORMAL PART_IS_ADDED
Reorganised existing partitions
------ ------
| | | |
| p0'| | p1'|
------ ------
p0 - p5 will be in the partitions list of partitions.
p0' and p1' will actually not exist as separate objects, there presence can
be deduced from the state of the partition and also the names of those
partitions can be deduced this way.
After adding the partitions and copying the partition data to p0', p1',
p4 and p5 from p0 and p1 the states change to adapt for the new situation
where p0 and p1 is dropped and replaced by p0' and p1' and the new p4 and
p5 are in the table again.
The first line above shows the states of the partitions before we start
adding and copying partitions, the second after completing the adding
and copying and finally the third line after also dropping the partitions
that are reorganised.
*/
if (*fast_alter_table &&
tab_part_info->part_type == HASH_PARTITION)
{
uint part_no= 0, start_part= 1, start_sec_part= 1;
uint end_part= 0, end_sec_part= 0;
uint upper_2n= tab_part_info->linear_hash_mask + 1;
uint lower_2n= upper_2n >> 1;
bool all_parts= TRUE;
if (tab_part_info->linear_hash_ind &&
num_new_partitions < upper_2n)
{
/*
An analysis of which parts needs reorganisation shows that it is
divided into two intervals. The first interval is those parts
that are reorganised up until upper_2n - 1. From upper_2n and
onwards it starts again from partition 0 and goes on until
it reaches p(upper_2n - 1). If the last new partition reaches
beyond upper_2n - 1 then the first interval will end with
p(lower_2n - 1) and start with p(num_orig_partitions - lower_2n).
If lower_2n partitions are added then p0 to p(lower_2n - 1) will
be reorganised which means that the two interval becomes one
interval at this point. Thus only when adding less than
lower_2n partitions and going beyond a total of upper_2n we
actually get two intervals.
To exemplify this assume we have 6 partitions to start with and
add 1, 2, 3, 5, 6, 7, 8, 9 partitions.
The first to add after p5 is p6 = 110 in bit numbers. Thus we
can see that 10 = p2 will be partition to reorganise if only one
partition.
If 2 partitions are added we reorganise [p2, p3]. Those two
cases are covered by the second if part below.
If 3 partitions are added we reorganise [p2, p3] U [p0,p0]. This
part is covered by the else part below.
If 5 partitions are added we get [p2,p3] U [p0, p2] = [p0, p3].
This is covered by the first if part where we need the max check
to here use lower_2n - 1.
If 7 partitions are added we get [p2,p3] U [p0, p4] = [p0, p4].
This is covered by the first if part but here we use the first
calculated end_part.
Finally with 9 new partitions we would also reorganise p6 if we
used the method below but we cannot reorganise more partitions
than what we had from the start and thus we simply set all_parts
to TRUE. In this case we don't get into this if-part at all.
*/
all_parts= FALSE;
if (num_new_partitions >= lower_2n)
{
/*
In this case there is only one interval since the two intervals
overlap and this starts from zero to last_part_no - upper_2n
*/
start_part= 0;
end_part= new_total_partitions - (upper_2n + 1);
end_part= max(lower_2n - 1, end_part);
}
else if (new_total_partitions <= upper_2n)
{
/*
Also in this case there is only one interval since we are not
going over a 2**n boundary
*/
start_part= num_orig_partitions - lower_2n;
end_part= start_part + (num_new_partitions - 1);
}
else
{
/* We have two non-overlapping intervals since we are not
passing a 2**n border and we have not at least lower_2n
new parts that would ensure that the intervals become
overlapping.
*/
start_part= num_orig_partitions - lower_2n;
end_part= upper_2n - 1;
start_sec_part= 0;
end_sec_part= new_total_partitions - (upper_2n + 1);
}
}
List_iterator<partition_element> tab_it(tab_part_info->partitions);
part_no= 0;
do
{
partition_element *p_elem= tab_it++;
if (all_parts ||
(part_no >= start_part && part_no <= end_part) ||
(part_no >= start_sec_part && part_no <= end_sec_part))
{
p_elem->part_state= PART_CHANGED;
}
} while (++part_no < num_orig_partitions);
}
/*
Need to concatenate the lists here to make it possible to check the
partition info for correctness using check_partition_info.
For on-line add partition we set the state of this partition to
PART_TO_BE_ADDED to ensure that it is known that it is not yet
usable (becomes usable when partition is created and the switch of
partition configuration is made.
*/
{
List_iterator<partition_element> alt_it(alt_part_info->partitions);
uint part_count= 0;
do
{
partition_element *part_elem= alt_it++;
if (*fast_alter_table)
part_elem->part_state= PART_TO_BE_ADDED;
if (tab_part_info->partitions.push_back(part_elem, thd->mem_root))
{
mem_alloc_error(1);
goto err;
}
} while (++part_count < num_new_partitions);
tab_part_info->num_parts+= num_new_partitions;
}
/*
If we specify partitions explicitly we don't use defaults anymore.
Using ADD PARTITION also means that we don't have the default number
of partitions anymore. We use this code also for Table reorganisations
and here we don't set any default flags to FALSE.
*/
if (!(alter_info->flags & Alter_info::ALTER_TABLE_REORG))
{
if (!alt_part_info->use_default_partitions)
{
DBUG_PRINT("info", ("part_info: 0x%lx", (long) tab_part_info));
tab_part_info->use_default_partitions= FALSE;
}
tab_part_info->use_default_num_partitions= FALSE;
tab_part_info->is_auto_partitioned= FALSE;
}
}
else if (alter_info->flags & Alter_info::ALTER_DROP_PARTITION)
{
/*
Drop a partition from a range partition and list partitioning is
always safe and can be made more or less immediate. It is necessary
however to ensure that the partition to be removed is safely removed
and that REPAIR TABLE can remove the partition if for some reason the
command to drop the partition failed in the middle.
*/
uint part_count= 0;
uint num_parts_dropped= alter_info->partition_names.elements;
uint num_parts_found= 0;
List_iterator<partition_element> part_it(tab_part_info->partitions);
tab_part_info->is_auto_partitioned= FALSE;
if (!(tab_part_info->part_type == RANGE_PARTITION ||
tab_part_info->part_type == LIST_PARTITION))
{
my_error(ER_ONLY_ON_RANGE_LIST_PARTITION, MYF(0), "DROP");
goto err;
}
if (num_parts_dropped >= tab_part_info->num_parts)
{
my_error(ER_DROP_LAST_PARTITION, MYF(0));
goto err;
}
do
{
partition_element *part_elem= part_it++;
if (is_name_in_list(part_elem->partition_name,
alter_info->partition_names))
{
/*
Set state to indicate that the partition is to be dropped.
*/
num_parts_found++;
part_elem->part_state= PART_TO_BE_DROPPED;
}
} while (++part_count < tab_part_info->num_parts);
if (num_parts_found != num_parts_dropped)
{
my_error(ER_DROP_PARTITION_NON_EXISTENT, MYF(0), "DROP");
goto err;
}
if (table->file->is_fk_defined_on_table_or_index(MAX_KEY))
{
my_error(ER_ROW_IS_REFERENCED, MYF(0));
goto err;
}
tab_part_info->num_parts-= num_parts_dropped;
}
else if (alter_info->flags & Alter_info::ALTER_REBUILD_PARTITION)
{
set_engine_all_partitions(tab_part_info,
tab_part_info->default_engine_type);
if (set_part_state(alter_info, tab_part_info, PART_CHANGED))
{
my_error(ER_DROP_PARTITION_NON_EXISTENT, MYF(0), "REBUILD");
goto err;
}
if (!(*fast_alter_table))
{
table->file->print_error(HA_ERR_WRONG_COMMAND, MYF(0));
goto err;
}
}
else if (alter_info->flags & Alter_info::ALTER_COALESCE_PARTITION)
{
uint num_parts_coalesced= alter_info->num_parts;
uint num_parts_remain= tab_part_info->num_parts - num_parts_coalesced;
List_iterator<partition_element> part_it(tab_part_info->partitions);
if (tab_part_info->part_type != HASH_PARTITION)
{
my_error(ER_COALESCE_ONLY_ON_HASH_PARTITION, MYF(0));
goto err;
}
if (num_parts_coalesced == 0)
{
my_error(ER_COALESCE_PARTITION_NO_PARTITION, MYF(0));
goto err;
}
if (num_parts_coalesced >= tab_part_info->num_parts)
{
my_error(ER_DROP_LAST_PARTITION, MYF(0));
goto err;
}
/*
Online handling:
COALESCE PARTITION:
-------------------
The figure below shows the manner in which partitions are handled when
performing an on-line coalesce partition and which states they go through
at start, after adding and copying partitions and finally after dropping
the partitions to drop. The figure shows an example using four partitions
to start with, using linear hash and coalescing one partition (always the
last partition).
Using linear hash then all remaining partitions will have a new reorganised
part.
Existing partitions Coalesced partition
------ ------ ------ | ------
| | | | | | | | |
| p0 | | p1 | | p2 | | | p3 |
------ ------ ------ | ------
PART_NORMAL PART_CHANGED PART_NORMAL PART_REORGED_DROPPED
PART_NORMAL PART_IS_CHANGED PART_NORMAL PART_TO_BE_DROPPED
PART_NORMAL PART_NORMAL PART_NORMAL PART_IS_DROPPED
Reorganised existing partitions
------
| |
| p1'|
------
p0 - p3 is in the partitions list.
The p1' partition will actually not be in any list it is deduced from the
state of p1.
*/
{
uint part_count= 0, start_part= 1, start_sec_part= 1;
uint end_part= 0, end_sec_part= 0;
bool all_parts= TRUE;
if (*fast_alter_table &&
tab_part_info->linear_hash_ind)
{
uint upper_2n= tab_part_info->linear_hash_mask + 1;
uint lower_2n= upper_2n >> 1;
all_parts= FALSE;
if (num_parts_coalesced >= lower_2n)
{
all_parts= TRUE;
}
else if (num_parts_remain >= lower_2n)
{
end_part= tab_part_info->num_parts - (lower_2n + 1);
start_part= num_parts_remain - lower_2n;
}
else
{
start_part= 0;
end_part= tab_part_info->num_parts - (lower_2n + 1);
end_sec_part= (lower_2n >> 1) - 1;
start_sec_part= end_sec_part - (lower_2n - (num_parts_remain + 1));
}
}
do
{
partition_element *p_elem= part_it++;
if (*fast_alter_table &&
(all_parts ||
(part_count >= start_part && part_count <= end_part) ||
(part_count >= start_sec_part && part_count <= end_sec_part)))
p_elem->part_state= PART_CHANGED;
if (++part_count > num_parts_remain)
{
if (*fast_alter_table)
p_elem->part_state= PART_REORGED_DROPPED;
else
part_it.remove();
}
} while (part_count < tab_part_info->num_parts);
tab_part_info->num_parts= num_parts_remain;
}
if (!(alter_info->flags & Alter_info::ALTER_TABLE_REORG))
{
tab_part_info->use_default_num_partitions= FALSE;
tab_part_info->is_auto_partitioned= FALSE;
}
}
else if (alter_info->flags & Alter_info::ALTER_REORGANIZE_PARTITION)
{
/*
Reorganise partitions takes a number of partitions that are next
to each other (at least for RANGE PARTITIONS) and then uses those
to create a set of new partitions. So data is copied from those
partitions into the new set of partitions. Those new partitions
can have more values in the LIST value specifications or less both
are allowed. The ranges can be different but since they are
changing a set of consecutive partitions they must cover the same
range as those changed from.
This command can be used on RANGE and LIST partitions.
*/
uint num_parts_reorged= alter_info->partition_names.elements;
uint num_parts_new= thd->work_part_info->partitions.elements;
uint check_total_partitions;
tab_part_info->is_auto_partitioned= FALSE;
if (num_parts_reorged > tab_part_info->num_parts)
{
my_error(ER_REORG_PARTITION_NOT_EXIST, MYF(0));
goto err;
}
if (!(tab_part_info->part_type == RANGE_PARTITION ||
tab_part_info->part_type == LIST_PARTITION) &&
(num_parts_new != num_parts_reorged))
{
my_error(ER_REORG_HASH_ONLY_ON_SAME_NO, MYF(0));
goto err;
}
if (tab_part_info->is_sub_partitioned() &&
alt_part_info->num_subparts &&
alt_part_info->num_subparts != tab_part_info->num_subparts)
{
my_error(ER_PARTITION_WRONG_NO_SUBPART_ERROR, MYF(0));
goto err;
}
check_total_partitions= tab_part_info->num_parts + num_parts_new;
check_total_partitions-= num_parts_reorged;
if (check_total_partitions > MAX_PARTITIONS)
{
my_error(ER_TOO_MANY_PARTITIONS_ERROR, MYF(0));
goto err;
}
alt_part_info->part_type= tab_part_info->part_type;
alt_part_info->subpart_type= tab_part_info->subpart_type;
alt_part_info->num_subparts= tab_part_info->num_subparts;
DBUG_ASSERT(!alt_part_info->use_default_partitions);
/* We specified partitions explicitly so don't use defaults anymore. */
tab_part_info->use_default_partitions= FALSE;
if (alt_part_info->set_up_defaults_for_partitioning(thd, table->file, 0,
0))
{
goto err;
}
/*
Online handling:
REORGANIZE PARTITION:
---------------------
The figure exemplifies the handling of partitions, their state changes and
how they are organised. It exemplifies four partitions where two of the
partitions are reorganised (p1 and p2) into two new partitions (p4 and p5).
The reason of this change could be to change range limits, change list
values or for hash partitions simply reorganise the partition which could
also involve moving them to new disks or new node groups (MySQL Cluster).
Existing partitions
------ ------ ------ ------
| | | | | | | |
| p0 | | p1 | | p2 | | p3 |
------ ------ ------ ------
PART_NORMAL PART_TO_BE_REORGED PART_NORMAL
PART_NORMAL PART_TO_BE_DROPPED PART_NORMAL
PART_NORMAL PART_IS_DROPPED PART_NORMAL
Reorganised new partitions (replacing p1 and p2)
------ ------
| | | |
| p4 | | p5 |
------ ------
PART_TO_BE_ADDED
PART_IS_ADDED
PART_IS_ADDED
All unchanged partitions and the new partitions are in the partitions list
in the order they will have when the change is completed. The reorganised
partitions are placed in the temp_partitions list. PART_IS_ADDED is only a
temporary state not written in the frm file. It is used to ensure we write
the generated partition syntax in a correct manner.
*/
{
List_iterator<partition_element> tab_it(tab_part_info->partitions);
uint part_count= 0;
bool found_first= FALSE;
bool found_last= FALSE;
uint drop_count= 0;
do
{
partition_element *part_elem= tab_it++;
is_last_partition_reorged= FALSE;
if (is_name_in_list(part_elem->partition_name,
alter_info->partition_names))
{
is_last_partition_reorged= TRUE;
drop_count++;
if (tab_part_info->column_list)
{
List_iterator<part_elem_value> p(part_elem->list_val_list);
tab_max_elem_val= p++;
}
else
tab_max_range= part_elem->range_value;
if (*fast_alter_table &&
tab_part_info->temp_partitions.push_back(part_elem,
thd->mem_root))
{
mem_alloc_error(1);
goto err;
}
if (*fast_alter_table)
part_elem->part_state= PART_TO_BE_REORGED;
if (!found_first)
{
uint alt_part_count= 0;
partition_element *alt_part_elem;
List_iterator<partition_element>
alt_it(alt_part_info->partitions);
found_first= TRUE;
do
{
alt_part_elem= alt_it++;
if (tab_part_info->column_list)
{
List_iterator<part_elem_value> p(alt_part_elem->list_val_list);
alt_max_elem_val= p++;
}
else
alt_max_range= alt_part_elem->range_value;
if (*fast_alter_table)
alt_part_elem->part_state= PART_TO_BE_ADDED;
if (alt_part_count == 0)
tab_it.replace(alt_part_elem);
else
tab_it.after(alt_part_elem);
} while (++alt_part_count < num_parts_new);
}
else if (found_last)
{
my_error(ER_CONSECUTIVE_REORG_PARTITIONS, MYF(0));
goto err;
}
else
tab_it.remove();
}
else
{
if (found_first)
found_last= TRUE;
}
} while (++part_count < tab_part_info->num_parts);
if (drop_count != num_parts_reorged)
{
my_error(ER_DROP_PARTITION_NON_EXISTENT, MYF(0), "REORGANIZE");
goto err;
}
tab_part_info->num_parts= check_total_partitions;
}
}
else
{
DBUG_ASSERT(FALSE);
}
*partition_changed= TRUE;
thd->work_part_info= tab_part_info;
if (alter_info->flags & Alter_info::ALTER_ADD_PARTITION ||
alter_info->flags & Alter_info::ALTER_REORGANIZE_PARTITION)
{
if (tab_part_info->use_default_subpartitions &&
!alt_part_info->use_default_subpartitions)
{
tab_part_info->use_default_subpartitions= FALSE;
tab_part_info->use_default_num_subpartitions= FALSE;
}
if (tab_part_info->check_partition_info(thd, (handlerton**)NULL,
table->file, 0, TRUE))
{
goto err;
}
/*
The check below needs to be performed after check_partition_info
since this function "fixes" the item trees of the new partitions
to reorganize into
*/
if (alter_info->flags == Alter_info::ALTER_REORGANIZE_PARTITION &&
tab_part_info->part_type == RANGE_PARTITION &&
((is_last_partition_reorged &&
(tab_part_info->column_list ?
(tab_part_info->compare_column_values(
alt_max_elem_val->col_val_array,
tab_max_elem_val->col_val_array) < 0) :
alt_max_range < tab_max_range)) ||
(!is_last_partition_reorged &&
(tab_part_info->column_list ?
(tab_part_info->compare_column_values(
alt_max_elem_val->col_val_array,
tab_max_elem_val->col_val_array) != 0) :
alt_max_range != tab_max_range))))
{
/*
For range partitioning the total resulting range before and
after the change must be the same except in one case. This is
when the last partition is reorganised, in this case it is
acceptable to increase the total range.
The reason is that it is not allowed to have "holes" in the
middle of the ranges and thus we should not allow to reorganise
to create "holes".
*/
my_error(ER_REORG_OUTSIDE_RANGE, MYF(0));
goto err;
}
}
}
else
{
/*
When thd->lex->part_info has a reference to a partition_info the
ALTER TABLE contained a definition of a partitioning.
Case I:
If there was a partition before and there is a new one defined.
We use the new partitioning. The new partitioning is already
defined in the correct variable so no work is needed to
accomplish this.
We do however need to update partition_changed to ensure that not
only the frm file is changed in the ALTER TABLE command.
Case IIa:
There was a partitioning before and there is no new one defined.
Also the user has not specified to remove partitioning explicitly.
We use the old partitioning also for the new table. We do this
by assigning the partition_info from the table loaded in
open_table to the partition_info struct used by mysql_create_table
later in this method.
Case IIb:
There was a partitioning before and there is no new one defined.
The user has specified explicitly to remove partitioning
Since the user has specified explicitly to remove partitioning
we override the old partitioning info and create a new table using
the specified engine.
In this case the partition also is changed.
Case III:
There was no partitioning before altering the table, there is
partitioning defined in the altered table. Use the new partitioning.
No work needed since the partitioning info is already in the
correct variable.
In this case we discover one case where the new partitioning is using
the same partition function as the default (PARTITION BY KEY or
PARTITION BY LINEAR KEY with the list of fields equal to the primary
key fields OR PARTITION BY [LINEAR] KEY() for tables without primary
key)
Also here partition has changed and thus a new table must be
created.
Case IV:
There was no partitioning before and no partitioning defined.
Obviously no work needed.
*/
partition_info *tab_part_info= table->part_info;
if (tab_part_info)
{
if (alter_info->flags & Alter_info::ALTER_REMOVE_PARTITIONING)
{
DBUG_PRINT("info", ("Remove partitioning"));
if (!(create_info->used_fields & HA_CREATE_USED_ENGINE))
{
DBUG_PRINT("info", ("No explicit engine used"));
create_info->db_type= tab_part_info->default_engine_type;
}
DBUG_PRINT("info", ("New engine type: %s",
ha_resolve_storage_engine_name(create_info->db_type)));
thd->work_part_info= NULL;
*partition_changed= TRUE;
}
else if (!thd->work_part_info)
{
/*
Retain partitioning but possibly with a new storage engine
beneath.
Create a copy of TABLE::part_info to be able to modify it freely.
*/
if (!(tab_part_info= tab_part_info->get_clone(thd)))
DBUG_RETURN(TRUE);
thd->work_part_info= tab_part_info;
if (create_info->used_fields & HA_CREATE_USED_ENGINE &&
create_info->db_type != tab_part_info->default_engine_type)
{
/*
Make sure change of engine happens to all partitions.
*/
DBUG_PRINT("info", ("partition changed"));
if (tab_part_info->is_auto_partitioned)
{
/*
If the user originally didn't specify partitioning to be
used we can remove it now.
*/
thd->work_part_info= NULL;
}
else
{
/*
Ensure that all partitions have the proper engine set-up
*/
set_engine_all_partitions(thd->work_part_info,
create_info->db_type);
}
*partition_changed= TRUE;
}
}
}
if (thd->work_part_info)
{
partition_info *part_info= thd->work_part_info;
bool is_native_partitioned= FALSE;
/*
Need to cater for engine types that can handle partition without
using the partition handler.
*/
if (part_info != tab_part_info)
{
if (part_info->fix_parser_data(thd))
{
goto err;
}
/*
Compare the old and new part_info. If only key_algorithm
change is done, don't consider it as changed partitioning (to avoid
rebuild). This is to handle KEY (numeric_cols) partitioned tables
created in 5.1. For more info, see bug#14521864.
*/
if (alter_info->flags != Alter_info::ALTER_PARTITION ||
!table->part_info ||
alter_info->requested_algorithm !=
Alter_info::ALTER_TABLE_ALGORITHM_INPLACE ||
!table->part_info->has_same_partitioning(part_info))
{
DBUG_PRINT("info", ("partition changed"));
*partition_changed= true;
}
}
/*
Set up partition default_engine_type either from the create_info
or from the previus table
*/
if (create_info->used_fields & HA_CREATE_USED_ENGINE)
part_info->default_engine_type= create_info->db_type;
else
{
if (tab_part_info)
part_info->default_engine_type= tab_part_info->default_engine_type;
else
part_info->default_engine_type= create_info->db_type;
}
DBUG_ASSERT(part_info->default_engine_type &&
part_info->default_engine_type != partition_hton);
if (check_native_partitioned(create_info, &is_native_partitioned,
part_info, thd))
{
goto err;
}
if (!is_native_partitioned)
{
DBUG_ASSERT(create_info->db_type);
create_info->db_type= partition_hton;
}
}
}
DBUG_RETURN(FALSE);
err:
*fast_alter_table= false;
DBUG_RETURN(TRUE);
}
/*
Change partitions, used to implement ALTER TABLE ADD/REORGANIZE/COALESCE
partitions. This method is used to implement both single-phase and multi-
phase implementations of ADD/REORGANIZE/COALESCE partitions.
SYNOPSIS
mysql_change_partitions()
lpt Struct containing parameters
RETURN VALUES
TRUE Failure
FALSE Success
DESCRIPTION
Request handler to add partitions as set in states of the partition
Elements of the lpt parameters used:
create_info Create information used to create partitions
db Database name
table_name Table name
copied Output parameter where number of copied
records are added
deleted Output parameter where number of deleted
records are added
*/
static bool mysql_change_partitions(ALTER_PARTITION_PARAM_TYPE *lpt)
{
char path[FN_REFLEN+1];
int error;
handler *file= lpt->table->file;
THD *thd= lpt->thd;
DBUG_ENTER("mysql_change_partitions");
build_table_filename(path, sizeof(path) - 1, lpt->db, lpt->table_name, "", 0);
if(mysql_trans_prepare_alter_copy_data(thd))
DBUG_RETURN(TRUE);
/* TODO: test if bulk_insert would increase the performance */
if ((error= file->ha_change_partitions(lpt->create_info, path, &lpt->copied,
&lpt->deleted, lpt->pack_frm_data,
lpt->pack_frm_len)))
{
file->print_error(error, MYF(error != ER_OUTOFMEMORY ? 0 : ME_FATALERROR));
}
if (mysql_trans_commit_alter_copy_data(thd))
error= 1; /* The error has been reported */
DBUG_RETURN(MY_TEST(error));
}
/*
Rename partitions in an ALTER TABLE of partitions
SYNOPSIS
mysql_rename_partitions()
lpt Struct containing parameters
RETURN VALUES
TRUE Failure
FALSE Success
DESCRIPTION
Request handler to rename partitions as set in states of the partition
Parameters used:
db Database name
table_name Table name
*/
static bool mysql_rename_partitions(ALTER_PARTITION_PARAM_TYPE *lpt)
{
char path[FN_REFLEN+1];
int error;
DBUG_ENTER("mysql_rename_partitions");
build_table_filename(path, sizeof(path) - 1, lpt->db, lpt->table_name, "", 0);
if ((error= lpt->table->file->ha_rename_partitions(path)))
{
if (error != 1)
lpt->table->file->print_error(error, MYF(0));
DBUG_RETURN(TRUE);
}
DBUG_RETURN(FALSE);
}
/*
Drop partitions in an ALTER TABLE of partitions
SYNOPSIS
mysql_drop_partitions()
lpt Struct containing parameters
RETURN VALUES
TRUE Failure
FALSE Success
DESCRIPTION
Drop the partitions marked with PART_TO_BE_DROPPED state and remove
those partitions from the list.
Parameters used:
table Table object
db Database name
table_name Table name
*/
static bool mysql_drop_partitions(ALTER_PARTITION_PARAM_TYPE *lpt)
{
char path[FN_REFLEN+1];
partition_info *part_info= lpt->table->part_info;
List_iterator<partition_element> part_it(part_info->partitions);
uint i= 0;
uint remove_count= 0;
int error;
DBUG_ENTER("mysql_drop_partitions");
DBUG_ASSERT(lpt->thd->mdl_context.is_lock_owner(MDL_key::TABLE,
lpt->table->s->db.str,
lpt->table->s->table_name.str,
MDL_EXCLUSIVE));
build_table_filename(path, sizeof(path) - 1, lpt->db, lpt->table_name, "", 0);
if ((error= lpt->table->file->ha_drop_partitions(path)))
{
lpt->table->file->print_error(error, MYF(0));
DBUG_RETURN(TRUE);
}
do
{
partition_element *part_elem= part_it++;
if (part_elem->part_state == PART_IS_DROPPED)
{
part_it.remove();
remove_count++;
}
} while (++i < part_info->num_parts);
part_info->num_parts-= remove_count;
DBUG_RETURN(FALSE);
}
/*
Insert log entry into list
SYNOPSIS
insert_part_info_log_entry_list()
log_entry
RETURN VALUES
NONE
*/
static void insert_part_info_log_entry_list(partition_info *part_info,
DDL_LOG_MEMORY_ENTRY *log_entry)
{
log_entry->next_active_log_entry= part_info->first_log_entry;
part_info->first_log_entry= log_entry;
}
/*
Release all log entries for this partition info struct
SYNOPSIS
release_part_info_log_entries()
first_log_entry First log entry in list to release
RETURN VALUES
NONE
*/
static void release_part_info_log_entries(DDL_LOG_MEMORY_ENTRY *log_entry)
{
DBUG_ENTER("release_part_info_log_entries");
while (log_entry)
{
release_ddl_log_memory_entry(log_entry);
log_entry= log_entry->next_active_log_entry;
}
DBUG_VOID_RETURN;
}
/*
Log an delete/rename frm file
SYNOPSIS
write_log_replace_delete_frm()
lpt Struct for parameters
next_entry Next reference to use in log record
from_path Name to rename from
to_path Name to rename to
replace_flag TRUE if replace, else delete
RETURN VALUES
TRUE Error
FALSE Success
DESCRIPTION
Support routine that writes a replace or delete of an frm file into the
ddl log. It also inserts an entry that keeps track of used space into
the partition info object
*/
static bool write_log_replace_delete_frm(ALTER_PARTITION_PARAM_TYPE *lpt,
uint next_entry,
const char *from_path,
const char *to_path,
bool replace_flag)
{
DDL_LOG_ENTRY ddl_log_entry;
DDL_LOG_MEMORY_ENTRY *log_entry;
DBUG_ENTER("write_log_replace_delete_frm");
if (replace_flag)
ddl_log_entry.action_type= DDL_LOG_REPLACE_ACTION;
else
ddl_log_entry.action_type= DDL_LOG_DELETE_ACTION;
ddl_log_entry.next_entry= next_entry;
ddl_log_entry.handler_name= reg_ext;
ddl_log_entry.name= to_path;
if (replace_flag)
ddl_log_entry.from_name= from_path;
if (write_ddl_log_entry(&ddl_log_entry, &log_entry))
{
DBUG_RETURN(TRUE);
}
insert_part_info_log_entry_list(lpt->part_info, log_entry);
DBUG_RETURN(FALSE);
}
/*
Log final partition changes in change partition
SYNOPSIS
write_log_changed_partitions()
lpt Struct containing parameters
RETURN VALUES
TRUE Error
FALSE Success
DESCRIPTION
This code is used to perform safe ADD PARTITION for HASH partitions
and COALESCE for HASH partitions and REORGANIZE for any type of
partitions.
We prepare entries for all partitions except the reorganised partitions
in REORGANIZE partition, those are handled by
write_log_dropped_partitions. For those partitions that are replaced
special care is needed to ensure that this is performed correctly and
this requires a two-phased approach with this log as a helper for this.
This code is closely intertwined with the code in rename_partitions in
the partition handler.
*/
static bool write_log_changed_partitions(ALTER_PARTITION_PARAM_TYPE *lpt,
uint *next_entry, const char *path)
{
DDL_LOG_ENTRY ddl_log_entry;
partition_info *part_info= lpt->part_info;
DDL_LOG_MEMORY_ENTRY *log_entry;
char tmp_path[FN_REFLEN];
char normal_path[FN_REFLEN];
List_iterator<partition_element> part_it(part_info->partitions);
uint temp_partitions= part_info->temp_partitions.elements;
uint num_elements= part_info->partitions.elements;
uint i= 0;
DBUG_ENTER("write_log_changed_partitions");
do
{
partition_element *part_elem= part_it++;
if (part_elem->part_state == PART_IS_CHANGED ||
(part_elem->part_state == PART_IS_ADDED && temp_partitions))
{
if (part_info->is_sub_partitioned())
{
List_iterator<partition_element> sub_it(part_elem->subpartitions);
uint num_subparts= part_info->num_subparts;
uint j= 0;
do
{
partition_element *sub_elem= sub_it++;
ddl_log_entry.next_entry= *next_entry;
ddl_log_entry.handler_name=
ha_resolve_storage_engine_name(sub_elem->engine_type);
create_subpartition_name(tmp_path, path,
part_elem->partition_name,
sub_elem->partition_name,
TEMP_PART_NAME);
create_subpartition_name(normal_path, path,
part_elem->partition_name,
sub_elem->partition_name,
NORMAL_PART_NAME);
ddl_log_entry.name= normal_path;
ddl_log_entry.from_name= tmp_path;
if (part_elem->part_state == PART_IS_CHANGED)
ddl_log_entry.action_type= DDL_LOG_REPLACE_ACTION;
else
ddl_log_entry.action_type= DDL_LOG_RENAME_ACTION;
if (write_ddl_log_entry(&ddl_log_entry, &log_entry))
{
DBUG_RETURN(TRUE);
}
*next_entry= log_entry->entry_pos;
sub_elem->log_entry= log_entry;
insert_part_info_log_entry_list(part_info, log_entry);
} while (++j < num_subparts);
}
else
{
ddl_log_entry.next_entry= *next_entry;
ddl_log_entry.handler_name=
ha_resolve_storage_engine_name(part_elem->engine_type);
create_partition_name(tmp_path, path,
part_elem->partition_name,
TEMP_PART_NAME, TRUE);
create_partition_name(normal_path, path,
part_elem->partition_name,
NORMAL_PART_NAME, TRUE);
ddl_log_entry.name= normal_path;
ddl_log_entry.from_name= tmp_path;
if (part_elem->part_state == PART_IS_CHANGED)
ddl_log_entry.action_type= DDL_LOG_REPLACE_ACTION;
else
ddl_log_entry.action_type= DDL_LOG_RENAME_ACTION;
if (write_ddl_log_entry(&ddl_log_entry, &log_entry))
{
DBUG_RETURN(TRUE);
}
*next_entry= log_entry->entry_pos;
part_elem->log_entry= log_entry;
insert_part_info_log_entry_list(part_info, log_entry);
}
}
} while (++i < num_elements);
DBUG_RETURN(FALSE);
}
/*
Log dropped partitions
SYNOPSIS
write_log_dropped_partitions()
lpt Struct containing parameters
RETURN VALUES
TRUE Error
FALSE Success
*/
static bool write_log_dropped_partitions(ALTER_PARTITION_PARAM_TYPE *lpt,
uint *next_entry,
const char *path,
bool temp_list)
{
DDL_LOG_ENTRY ddl_log_entry;
partition_info *part_info= lpt->part_info;
DDL_LOG_MEMORY_ENTRY *log_entry;
char tmp_path[FN_LEN];
List_iterator<partition_element> part_it(part_info->partitions);
List_iterator<partition_element> temp_it(part_info->temp_partitions);
uint num_temp_partitions= part_info->temp_partitions.elements;
uint num_elements= part_info->partitions.elements;
DBUG_ENTER("write_log_dropped_partitions");
ddl_log_entry.action_type= DDL_LOG_DELETE_ACTION;
if (temp_list)
num_elements= num_temp_partitions;
while (num_elements--)
{
partition_element *part_elem;
if (temp_list)
part_elem= temp_it++;
else
part_elem= part_it++;
if (part_elem->part_state == PART_TO_BE_DROPPED ||
part_elem->part_state == PART_TO_BE_ADDED ||
part_elem->part_state == PART_CHANGED)
{
uint name_variant;
if (part_elem->part_state == PART_CHANGED ||
(part_elem->part_state == PART_TO_BE_ADDED &&
num_temp_partitions))
name_variant= TEMP_PART_NAME;
else
name_variant= NORMAL_PART_NAME;
if (part_info->is_sub_partitioned())
{
List_iterator<partition_element> sub_it(part_elem->subpartitions);
uint num_subparts= part_info->num_subparts;
uint j= 0;
do
{
partition_element *sub_elem= sub_it++;
ddl_log_entry.next_entry= *next_entry;
ddl_log_entry.handler_name=
ha_resolve_storage_engine_name(sub_elem->engine_type);
create_subpartition_name(tmp_path, path,
part_elem->partition_name,
sub_elem->partition_name,
name_variant);
ddl_log_entry.name= tmp_path;
if (write_ddl_log_entry(&ddl_log_entry, &log_entry))
{
DBUG_RETURN(TRUE);
}
*next_entry= log_entry->entry_pos;
sub_elem->log_entry= log_entry;
insert_part_info_log_entry_list(part_info, log_entry);
} while (++j < num_subparts);
}
else
{
ddl_log_entry.next_entry= *next_entry;
ddl_log_entry.handler_name=
ha_resolve_storage_engine_name(part_elem->engine_type);
create_partition_name(tmp_path, path,
part_elem->partition_name,
name_variant, TRUE);
ddl_log_entry.name= tmp_path;
if (write_ddl_log_entry(&ddl_log_entry, &log_entry))
{
DBUG_RETURN(TRUE);
}
*next_entry= log_entry->entry_pos;
part_elem->log_entry= log_entry;
insert_part_info_log_entry_list(part_info, log_entry);
}
}
}
DBUG_RETURN(FALSE);
}
/*
Set execute log entry in ddl log for this partitioned table
SYNOPSIS
set_part_info_exec_log_entry()
part_info Partition info object
exec_log_entry Log entry
RETURN VALUES
NONE
*/
static void set_part_info_exec_log_entry(partition_info *part_info,
DDL_LOG_MEMORY_ENTRY *exec_log_entry)
{
part_info->exec_log_entry= exec_log_entry;
exec_log_entry->next_active_log_entry= NULL;
}
/*
Write the log entry to ensure that the shadow frm file is removed at
crash.
SYNOPSIS
write_log_drop_shadow_frm()
lpt Struct containing parameters
install_frm Should we log action to install shadow frm or should
the action be to remove the shadow frm file.
RETURN VALUES
TRUE Error
FALSE Success
DESCRIPTION
Prepare an entry to the ddl log indicating a drop/install of the shadow frm
file and its corresponding handler file.
*/
static bool write_log_drop_shadow_frm(ALTER_PARTITION_PARAM_TYPE *lpt)
{
partition_info *part_info= lpt->part_info;
DDL_LOG_MEMORY_ENTRY *log_entry;
DDL_LOG_MEMORY_ENTRY *exec_log_entry= NULL;
char shadow_path[FN_REFLEN + 1];
DBUG_ENTER("write_log_drop_shadow_frm");
build_table_shadow_filename(shadow_path, sizeof(shadow_path) - 1, lpt);
mysql_mutex_lock(&LOCK_gdl);
if (write_log_replace_delete_frm(lpt, 0UL, NULL,
(const char*)shadow_path, FALSE))
goto error;
log_entry= part_info->first_log_entry;
if (write_execute_ddl_log_entry(log_entry->entry_pos,
FALSE, &exec_log_entry))
goto error;
mysql_mutex_unlock(&LOCK_gdl);
set_part_info_exec_log_entry(part_info, exec_log_entry);
DBUG_RETURN(FALSE);
error:
release_part_info_log_entries(part_info->first_log_entry);
mysql_mutex_unlock(&LOCK_gdl);
part_info->first_log_entry= NULL;
my_error(ER_DDL_LOG_ERROR, MYF(0));
DBUG_RETURN(TRUE);
}
/*
Log renaming of shadow frm to real frm name and dropping of old frm
SYNOPSIS
write_log_rename_frm()
lpt Struct containing parameters
RETURN VALUES
TRUE Error
FALSE Success
DESCRIPTION
Prepare an entry to ensure that we complete the renaming of the frm
file if failure occurs in the middle of the rename process.
*/
static bool write_log_rename_frm(ALTER_PARTITION_PARAM_TYPE *lpt)
{
partition_info *part_info= lpt->part_info;
DDL_LOG_MEMORY_ENTRY *log_entry;
DDL_LOG_MEMORY_ENTRY *exec_log_entry= part_info->exec_log_entry;
char path[FN_REFLEN + 1];
char shadow_path[FN_REFLEN + 1];
DDL_LOG_MEMORY_ENTRY *old_first_log_entry= part_info->first_log_entry;
DBUG_ENTER("write_log_rename_frm");
part_info->first_log_entry= NULL;
build_table_filename(path, sizeof(path) - 1, lpt->db,
lpt->table_name, "", 0);
build_table_shadow_filename(shadow_path, sizeof(shadow_path) - 1, lpt);
mysql_mutex_lock(&LOCK_gdl);
if (write_log_replace_delete_frm(lpt, 0UL, shadow_path, path, TRUE))
goto error;
log_entry= part_info->first_log_entry;
part_info->frm_log_entry= log_entry;
if (write_execute_ddl_log_entry(log_entry->entry_pos,
FALSE, &exec_log_entry))
goto error;
release_part_info_log_entries(old_first_log_entry);
mysql_mutex_unlock(&LOCK_gdl);
DBUG_RETURN(FALSE);
error:
release_part_info_log_entries(part_info->first_log_entry);
mysql_mutex_unlock(&LOCK_gdl);
part_info->first_log_entry= old_first_log_entry;
part_info->frm_log_entry= NULL;
my_error(ER_DDL_LOG_ERROR, MYF(0));
DBUG_RETURN(TRUE);
}
/*
Write the log entries to ensure that the drop partition command is completed
even in the presence of a crash.
SYNOPSIS
write_log_drop_partition()
lpt Struct containing parameters
RETURN VALUES
TRUE Error
FALSE Success
DESCRIPTION
Prepare entries to the ddl log indicating all partitions to drop and to
install the shadow frm file and remove the old frm file.
*/
static bool write_log_drop_partition(ALTER_PARTITION_PARAM_TYPE *lpt)
{
partition_info *part_info= lpt->part_info;
DDL_LOG_MEMORY_ENTRY *log_entry;
DDL_LOG_MEMORY_ENTRY *exec_log_entry= part_info->exec_log_entry;
char tmp_path[FN_REFLEN + 1];
char path[FN_REFLEN + 1];
uint next_entry= 0;
DDL_LOG_MEMORY_ENTRY *old_first_log_entry= part_info->first_log_entry;
DBUG_ENTER("write_log_drop_partition");
part_info->first_log_entry= NULL;
build_table_filename(path, sizeof(path) - 1, lpt->db,
lpt->table_name, "", 0);
build_table_shadow_filename(tmp_path, sizeof(tmp_path) - 1, lpt);
mysql_mutex_lock(&LOCK_gdl);
if (write_log_dropped_partitions(lpt, &next_entry, (const char*)path,
FALSE))
goto error;
if (write_log_replace_delete_frm(lpt, next_entry, (const char*)tmp_path,
(const char*)path, TRUE))
goto error;
log_entry= part_info->first_log_entry;
part_info->frm_log_entry= log_entry;
if (write_execute_ddl_log_entry(log_entry->entry_pos,
FALSE, &exec_log_entry))
goto error;
release_part_info_log_entries(old_first_log_entry);
mysql_mutex_unlock(&LOCK_gdl);
DBUG_RETURN(FALSE);
error:
release_part_info_log_entries(part_info->first_log_entry);
mysql_mutex_unlock(&LOCK_gdl);
part_info->first_log_entry= old_first_log_entry;
part_info->frm_log_entry= NULL;
my_error(ER_DDL_LOG_ERROR, MYF(0));
DBUG_RETURN(TRUE);
}
/*
Write the log entries to ensure that the add partition command is not
executed at all if a crash before it has completed
SYNOPSIS
write_log_add_change_partition()
lpt Struct containing parameters
RETURN VALUES
TRUE Error
FALSE Success
DESCRIPTION
Prepare entries to the ddl log indicating all partitions to drop and to
remove the shadow frm file.
We always inject entries backwards in the list in the ddl log since we
don't know the entry position until we have written it.
*/
static bool write_log_add_change_partition(ALTER_PARTITION_PARAM_TYPE *lpt)
{
partition_info *part_info= lpt->part_info;
DDL_LOG_MEMORY_ENTRY *log_entry;
DDL_LOG_MEMORY_ENTRY *exec_log_entry= part_info->exec_log_entry;
char tmp_path[FN_REFLEN + 1];
char path[FN_REFLEN + 1];
uint next_entry= 0;
DDL_LOG_MEMORY_ENTRY *old_first_log_entry= part_info->first_log_entry;
/* write_log_drop_shadow_frm(lpt) must have been run first */
DBUG_ASSERT(old_first_log_entry);
DBUG_ENTER("write_log_add_change_partition");
build_table_filename(path, sizeof(path) - 1, lpt->db,
lpt->table_name, "", 0);
build_table_shadow_filename(tmp_path, sizeof(tmp_path) - 1, lpt);
mysql_mutex_lock(&LOCK_gdl);
/* Relink the previous drop shadow frm entry */
if (old_first_log_entry)
next_entry= old_first_log_entry->entry_pos;
if (write_log_dropped_partitions(lpt, &next_entry, (const char*)path,
FALSE))
goto error;
log_entry= part_info->first_log_entry;
if (write_execute_ddl_log_entry(log_entry->entry_pos,
FALSE,
/* Reuse the old execute ddl_log_entry */
&exec_log_entry))
goto error;
mysql_mutex_unlock(&LOCK_gdl);
set_part_info_exec_log_entry(part_info, exec_log_entry);
DBUG_RETURN(FALSE);
error:
release_part_info_log_entries(part_info->first_log_entry);
mysql_mutex_unlock(&LOCK_gdl);
part_info->first_log_entry= old_first_log_entry;
my_error(ER_DDL_LOG_ERROR, MYF(0));
DBUG_RETURN(TRUE);
}
/*
Write description of how to complete the operation after first phase of
change partitions.
SYNOPSIS
write_log_final_change_partition()
lpt Struct containing parameters
RETURN VALUES
TRUE Error
FALSE Success
DESCRIPTION
We will write log entries that specify to
1) Install the shadow frm file.
2) Remove all partitions reorganized. (To be able to reorganize a partition
to the same name. Like in REORGANIZE p0 INTO (p0, p1),
so that the later rename from the new p0-temporary name to p0 don't
fail because the partition already exists.
3) Rename others to reflect the new naming scheme.
Note that it is written in the ddl log in reverse.
*/
static bool write_log_final_change_partition(ALTER_PARTITION_PARAM_TYPE *lpt)
{
partition_info *part_info= lpt->part_info;
DDL_LOG_MEMORY_ENTRY *log_entry;
DDL_LOG_MEMORY_ENTRY *exec_log_entry= part_info->exec_log_entry;
char path[FN_REFLEN + 1];
char shadow_path[FN_REFLEN + 1];
DDL_LOG_MEMORY_ENTRY *old_first_log_entry= part_info->first_log_entry;
uint next_entry= 0;
DBUG_ENTER("write_log_final_change_partition");
/*
Do not link any previous log entry.
Replace the revert operations with forced retry operations.
*/
part_info->first_log_entry= NULL;
build_table_filename(path, sizeof(path) - 1, lpt->db,
lpt->table_name, "", 0);
build_table_shadow_filename(shadow_path, sizeof(shadow_path) - 1, lpt);
mysql_mutex_lock(&LOCK_gdl);
if (write_log_changed_partitions(lpt, &next_entry, (const char*)path))
goto error;
if (write_log_dropped_partitions(lpt, &next_entry, (const char*)path,
lpt->alter_info->flags &
Alter_info::ALTER_REORGANIZE_PARTITION))
goto error;
if (write_log_replace_delete_frm(lpt, next_entry, shadow_path, path, TRUE))
goto error;
log_entry= part_info->first_log_entry;
part_info->frm_log_entry= log_entry;
/* Overwrite the revert execute log entry with this retry execute entry */
if (write_execute_ddl_log_entry(log_entry->entry_pos,
FALSE, &exec_log_entry))
goto error;
release_part_info_log_entries(old_first_log_entry);
mysql_mutex_unlock(&LOCK_gdl);
DBUG_RETURN(FALSE);
error:
release_part_info_log_entries(part_info->first_log_entry);
mysql_mutex_unlock(&LOCK_gdl);
part_info->first_log_entry= old_first_log_entry;
part_info->frm_log_entry= NULL;
my_error(ER_DDL_LOG_ERROR, MYF(0));
DBUG_RETURN(TRUE);
}
/*
Remove entry from ddl log and release resources for others to use
SYNOPSIS
write_log_completed()
lpt Struct containing parameters
RETURN VALUES
TRUE Error
FALSE Success
*/
static void write_log_completed(ALTER_PARTITION_PARAM_TYPE *lpt,
bool dont_crash)
{
partition_info *part_info= lpt->part_info;
DDL_LOG_MEMORY_ENTRY *log_entry= part_info->exec_log_entry;
DBUG_ENTER("write_log_completed");
DBUG_ASSERT(log_entry);
mysql_mutex_lock(&LOCK_gdl);
if (write_execute_ddl_log_entry(0UL, TRUE, &log_entry))
{
/*
Failed to write, Bad...
We have completed the operation but have log records to REMOVE
stuff that shouldn't be removed. What clever things could one do
here? An error output was written to the error output by the
above method so we don't do anything here.
*/
;
}
release_part_info_log_entries(part_info->first_log_entry);
release_part_info_log_entries(part_info->exec_log_entry);
mysql_mutex_unlock(&LOCK_gdl);
part_info->exec_log_entry= NULL;
part_info->first_log_entry= NULL;
DBUG_VOID_RETURN;
}
/*
Release all log entries
SYNOPSIS
release_log_entries()
part_info Partition info struct
RETURN VALUES
NONE
*/
static void release_log_entries(partition_info *part_info)
{
mysql_mutex_lock(&LOCK_gdl);
release_part_info_log_entries(part_info->first_log_entry);
release_part_info_log_entries(part_info->exec_log_entry);
mysql_mutex_unlock(&LOCK_gdl);
part_info->first_log_entry= NULL;
part_info->exec_log_entry= NULL;
}
/*
Final part of partition changes to handle things when under
LOCK TABLES.
SYNPOSIS
alter_partition_lock_handling()
lpt Struct carrying parameters
RETURN VALUES
NONE
*/
static void alter_partition_lock_handling(ALTER_PARTITION_PARAM_TYPE *lpt)
{
THD *thd= lpt->thd;
if (lpt->table)
{
/*
Remove all instances of the table and its locks and other resources.
*/
close_all_tables_for_name(thd, lpt->table->s, HA_EXTRA_NOT_USED, NULL);
}
lpt->table= 0;
lpt->table_list->table= 0;
if (thd->locked_tables_mode)
{
Diagnostics_area *stmt_da= NULL;
Diagnostics_area tmp_stmt_da(true);
if (thd->is_error())
{
/* reopen might fail if we have a previous error, use a temporary da. */
stmt_da= thd->get_stmt_da();
thd->set_stmt_da(&tmp_stmt_da);
}
if (thd->locked_tables_list.reopen_tables(thd))
sql_print_warning("We failed to reacquire LOCKs in ALTER TABLE");
if (stmt_da)
thd->set_stmt_da(stmt_da);
}
}
/**
Unlock and close table before renaming and dropping partitions.
@param lpt Struct carrying parameters
@return Always 0.
*/
static int alter_close_table(ALTER_PARTITION_PARAM_TYPE *lpt)
{
DBUG_ENTER("alter_close_table");
if (lpt->table->db_stat)
{
mysql_lock_remove(lpt->thd, lpt->thd->lock, lpt->table);
lpt->table->file->ha_close();
lpt->table->db_stat= 0; // Mark file closed
}
DBUG_RETURN(0);
}
/**
Handle errors for ALTER TABLE for partitioning.
@param lpt Struct carrying parameters
@param action_completed The action must be completed, NOT reverted
@param drop_partition Partitions has not been dropped yet
@param frm_install The shadow frm-file has not yet been installed
@param close_table Table is still open, close it before reverting
*/
void handle_alter_part_error(ALTER_PARTITION_PARAM_TYPE *lpt,
bool action_completed,
bool drop_partition,
bool frm_install,
bool close_table)
{
partition_info *part_info= lpt->part_info;
THD *thd= lpt->thd;
TABLE *table= lpt->table;
DBUG_ENTER("handle_alter_part_error");
DBUG_ASSERT(table->m_needs_reopen);
if (close_table)
{
/*
All instances of this table needs to be closed.
Better to do that here, than leave the cleaning up to others.
Aquire EXCLUSIVE mdl lock if not already aquired.
*/
if (!thd->mdl_context.is_lock_owner(MDL_key::TABLE, lpt->db,
lpt->table_name,
MDL_EXCLUSIVE))
{
if (wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN))
{
/* At least remove this instance on failure */
goto err_exclusive_lock;
}
}
/* Ensure the share is destroyed and reopened. */
if (part_info)
part_info= part_info->get_clone(thd);
close_all_tables_for_name(thd, table->s, HA_EXTRA_NOT_USED, NULL);
}
else
{
err_exclusive_lock:
/*
Temporarily remove it from the locked table list, so that it will get
reopened.
*/
thd->locked_tables_list.unlink_from_list(thd,
table->pos_in_locked_tables,
false);
/*
Make sure that the table is unlocked, closed and removed from
the table cache.
*/
mysql_lock_remove(thd, thd->lock, table);
if (part_info)
part_info= part_info->get_clone(thd);
close_thread_table(thd, &thd->open_tables);
lpt->table_list->table= NULL;
}
if (part_info->first_log_entry &&
execute_ddl_log_entry(thd, part_info->first_log_entry->entry_pos))
{
/*
We couldn't recover from error, most likely manual interaction
is required.
*/
write_log_completed(lpt, FALSE);
release_log_entries(part_info);
if (!action_completed)
{
if (drop_partition)
{
/* Table is still ok, but we left a shadow frm file behind. */
push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN, 1,
"%s %s",
"Operation was unsuccessful, table is still intact,",
"but it is possible that a shadow frm file was left behind");
}
else
{
push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN, 1,
"%s %s %s %s",
"Operation was unsuccessful, table is still intact,",
"but it is possible that a shadow frm file was left behind.",
"It is also possible that temporary partitions are left behind,",
"these could be empty or more or less filled with records");
}
}
else
{
if (frm_install)
{
/*
Failed during install of shadow frm file, table isn't intact
and dropped partitions are still there
*/
push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN, 1,
"%s %s %s",
"Failed during alter of partitions, table is no longer intact.",
"The frm file is in an unknown state, and a backup",
"is required.");
}
else if (drop_partition)
{
/*
Table is ok, we have switched to new table but left dropped
partitions still in their places. We remove the log records and
ask the user to perform the action manually. We remove the log
records and ask the user to perform the action manually.
*/
push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN, 1,
"%s %s",
"Failed during drop of partitions, table is intact.",
"Manual drop of remaining partitions is required");
}
else
{
/*
We failed during renaming of partitions. The table is most
certainly in a very bad state so we give user warning and disable
the table by writing an ancient frm version into it.
*/
push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN, 1,
"%s %s %s",
"Failed during renaming of partitions. We are now in a position",
"where table is not reusable",
"Table is disabled by writing ancient frm file version into it");
}
}
}
else
{
release_log_entries(part_info);
if (!action_completed)
{
/*
We hit an error before things were completed but managed
to recover from the error. An error occurred and we have
restored things to original so no need for further action.
*/
;
}
else
{
/*
We hit an error after we had completed most of the operation
and were successful in a second attempt so the operation
actually is successful now. We need to issue a warning that
even though we reported an error the operation was successfully
completed.
*/
push_warning_printf(thd, Sql_condition::WARN_LEVEL_WARN, 1,"%s %s",
"Operation was successfully completed by failure handling,",
"after failure of normal operation");
}
}
if (thd->locked_tables_mode)
{
Diagnostics_area *stmt_da= NULL;
Diagnostics_area tmp_stmt_da(true);
if (thd->is_error())
{
/* reopen might fail if we have a previous error, use a temporary da. */
stmt_da= thd->get_stmt_da();
thd->set_stmt_da(&tmp_stmt_da);
}
if (thd->locked_tables_list.reopen_tables(thd))
sql_print_warning("We failed to reacquire LOCKs in ALTER TABLE");
if (stmt_da)
thd->set_stmt_da(stmt_da);
}
DBUG_VOID_RETURN;
}
/**
Downgrade an exclusive MDL lock if under LOCK TABLE.
If we don't downgrade the lock, it will not be downgraded or released
until the table is unlocked, resulting in blocking other threads using
the table.
*/
static void downgrade_mdl_if_lock_tables_mode(THD *thd, MDL_ticket *ticket,
enum_mdl_type type)
{
if (thd->locked_tables_mode)
ticket->downgrade_lock(type);
}
/**
Actually perform the change requested by ALTER TABLE of partitions
previously prepared.
@param thd Thread object
@param table Original table object with new part_info
@param alter_info ALTER TABLE info
@param create_info Create info for CREATE TABLE
@param table_list List of the table involved
@param db Database name of new table
@param table_name Table name of new table
@return Operation status
@retval TRUE Error
@retval FALSE Success
@note
Perform all ALTER TABLE operations for partitioned tables that can be
performed fast without a full copy of the original table.
*/
uint fast_alter_partition_table(THD *thd, TABLE *table,
Alter_info *alter_info,
HA_CREATE_INFO *create_info,
TABLE_LIST *table_list,
const char *db,
const char *table_name)
{
/* Set-up struct used to write frm files */
partition_info *part_info;
ALTER_PARTITION_PARAM_TYPE lpt_obj;
ALTER_PARTITION_PARAM_TYPE *lpt= &lpt_obj;
bool action_completed= FALSE;
bool close_table_on_failure= FALSE;
bool frm_install= FALSE;
MDL_ticket *mdl_ticket= table->mdl_ticket;
DBUG_ENTER("fast_alter_partition_table");
DBUG_ASSERT(table->m_needs_reopen);
part_info= table->part_info;
lpt->thd= thd;
lpt->table_list= table_list;
lpt->part_info= part_info;
lpt->alter_info= alter_info;
lpt->create_info= create_info;
lpt->db_options= create_info->table_options;
if (create_info->row_type == ROW_TYPE_DYNAMIC)
lpt->db_options|= HA_OPTION_PACK_RECORD;
lpt->table= table;
lpt->key_info_buffer= 0;
lpt->key_count= 0;
lpt->db= db;
lpt->table_name= table_name;
lpt->copied= 0;
lpt->deleted= 0;
lpt->pack_frm_data= NULL;
lpt->pack_frm_len= 0;
if (table->file->alter_table_flags(alter_info->flags) &
HA_PARTITION_ONE_PHASE)
{
/*
In the case where the engine supports one phase online partition
changes it is not necessary to have any exclusive locks. The
correctness is upheld instead by transactions being aborted if they
access the table after its partition definition has changed (if they
are still using the old partition definition).
The handler is in this case responsible to ensure that all users
start using the new frm file after it has changed. To implement
one phase it is necessary for the handler to have the master copy
of the frm file and use discovery mechanisms to renew it. Thus
write frm will write the frm, pack the new frm and finally
the frm is deleted and the discovery mechanisms will either restore
back to the old or installing the new after the change is activated.
Thus all open tables will be discovered that they are old, if not
earlier as soon as they try an operation using the old table. One
should ensure that this is checked already when opening a table,
even if it is found in the cache of open tables.
change_partitions will perform all operations and it is the duty of
the handler to ensure that the frm files in the system gets updated
in synch with the changes made and if an error occurs that a proper
error handling is done.
If the MySQL Server crashes at this moment but the handler succeeds
in performing the change then the binlog is not written for the
change. There is no way to solve this as long as the binlog is not
transactional and even then it is hard to solve it completely.
The first approach here was to downgrade locks. Now a different approach
is decided upon. The idea is that the handler will have access to the
Alter_info when store_lock arrives with TL_WRITE_ALLOW_READ. So if the
handler knows that this functionality can be handled with a lower lock
level it will set the lock level to TL_WRITE_ALLOW_WRITE immediately.
Thus the need to downgrade the lock disappears.
1) Write the new frm, pack it and then delete it
2) Perform the change within the handler
*/
if (mysql_write_frm(lpt, WFRM_WRITE_SHADOW) ||
mysql_change_partitions(lpt))
{
goto err;
}
}
else if (alter_info->flags & Alter_info::ALTER_DROP_PARTITION)
{
/*
Now after all checks and setting state on dropped partitions we can
start the actual dropping of the partitions.
Drop partition is actually two things happening. The first is that
a lot of records are deleted. The second is that the behaviour of
subsequent updates and writes and deletes will change. The delete
part can be handled without any particular high lock level by
transactional engines whereas non-transactional engines need to
ensure that this change is done with an exclusive lock on the table.
The second part, the change of partitioning does however require
an exclusive lock to install the new partitioning as one atomic
operation. If this is not the case, it is possible for two
transactions to see the change in a different order than their
serialisation order. Thus we need an exclusive lock for both
transactional and non-transactional engines.
For LIST partitions it could be possible to avoid the exclusive lock
(and for RANGE partitions if they didn't rearrange range definitions
after a DROP PARTITION) if one ensured that failed accesses to the
dropped partitions was aborted for sure (thus only possible for
transactional engines).
0) Write an entry that removes the shadow frm file if crash occurs
1) Write the new frm file as a shadow frm
2) Get an exclusive metadata lock on the table (waits for all active
transactions using this table). This ensures that we
can release all other locks on the table and since no one can open
the table, there can be no new threads accessing the table. They
will be hanging on this exclusive lock.
3) Write the ddl log to ensure that the operation is completed
even in the presence of a MySQL Server crash (the log is executed
before any other threads are started, so there are no locking issues).
4) Close the table that have already been opened but didn't stumble on
the abort locked previously. This is done as part of the
alter_close_table call.
5) Write the bin log
Unfortunately the writing of the binlog is not synchronised with
other logging activities. So no matter in which order the binlog
is written compared to other activities there will always be cases
where crashes make strange things occur. In this placement it can
happen that the ALTER TABLE DROP PARTITION gets performed in the
master but not in the slaves if we have a crash, after writing the
ddl log but before writing the binlog. A solution to this would
require writing the statement first in the ddl log and then
when recovering from the crash read the binlog and insert it into
the binlog if not written already.
6) Install the previously written shadow frm file
7) Prepare handlers for drop of partitions
8) Drop the partitions
9) Remove entries from ddl log
10) Reopen table if under lock tables
11) Complete query
We insert Error injections at all places where it could be interesting
to test if recovery is properly done.
*/
if (write_log_drop_shadow_frm(lpt) ||
ERROR_INJECT_CRASH("crash_drop_partition_1") ||
ERROR_INJECT_ERROR("fail_drop_partition_1") ||
mysql_write_frm(lpt, WFRM_WRITE_SHADOW) ||
ERROR_INJECT_CRASH("crash_drop_partition_2") ||
ERROR_INJECT_ERROR("fail_drop_partition_2") ||
wait_while_table_is_used(thd, table, HA_EXTRA_NOT_USED) ||
ERROR_INJECT_CRASH("crash_drop_partition_3") ||
ERROR_INJECT_ERROR("fail_drop_partition_3") ||
(close_table_on_failure= TRUE, FALSE) ||
write_log_drop_partition(lpt) ||
(action_completed= TRUE, FALSE) ||
ERROR_INJECT_CRASH("crash_drop_partition_4") ||
ERROR_INJECT_ERROR("fail_drop_partition_4") ||
alter_close_table(lpt) ||
(close_table_on_failure= FALSE, FALSE) ||
ERROR_INJECT_CRASH("crash_drop_partition_5") ||
ERROR_INJECT_ERROR("fail_drop_partition_5") ||
((!thd->lex->no_write_to_binlog) &&
(write_bin_log(thd, FALSE,
thd->query(), thd->query_length()), FALSE)) ||
ERROR_INJECT_CRASH("crash_drop_partition_6") ||
ERROR_INJECT_ERROR("fail_drop_partition_6") ||
(frm_install= TRUE, FALSE) ||
mysql_write_frm(lpt, WFRM_INSTALL_SHADOW) ||
(frm_install= FALSE, FALSE) ||
ERROR_INJECT_CRASH("crash_drop_partition_7") ||
ERROR_INJECT_ERROR("fail_drop_partition_7") ||
mysql_drop_partitions(lpt) ||
ERROR_INJECT_CRASH("crash_drop_partition_8") ||
ERROR_INJECT_ERROR("fail_drop_partition_8") ||
(write_log_completed(lpt, FALSE), FALSE) ||
ERROR_INJECT_CRASH("crash_drop_partition_9") ||
ERROR_INJECT_ERROR("fail_drop_partition_9") ||
(alter_partition_lock_handling(lpt), FALSE))
{
handle_alter_part_error(lpt, action_completed, TRUE, frm_install,
close_table_on_failure);
goto err;
}
}
else if ((alter_info->flags & Alter_info::ALTER_ADD_PARTITION) &&
(part_info->part_type == RANGE_PARTITION ||
part_info->part_type == LIST_PARTITION))
{
/*
ADD RANGE/LIST PARTITIONS
In this case there are no tuples removed and no tuples are added.
Thus the operation is merely adding a new partition. Thus it is
necessary to perform the change as an atomic operation. Otherwise
someone reading without seeing the new partition could potentially
miss updates made by a transaction serialised before it that are
inserted into the new partition.
0) Write an entry that removes the shadow frm file if crash occurs
1) Write the new frm file as a shadow frm file
2) Get an exclusive metadata lock on the table (waits for all active
transactions using this table). This ensures that we
can release all other locks on the table and since no one can open
the table, there can be no new threads accessing the table. They
will be hanging on this exclusive lock.
3) Write an entry to remove the new parttions if crash occurs
4) Add the new partitions.
5) Close all instances of the table and remove them from the table cache.
6) Write binlog
7) Now the change is completed except for the installation of the
new frm file. We thus write an action in the log to change to
the shadow frm file
8) Install the new frm file of the table where the partitions are
added to the table.
9) Remove entries from ddl log
10)Reopen tables if under lock tables
11)Complete query
*/
if (write_log_drop_shadow_frm(lpt) ||
ERROR_INJECT_CRASH("crash_add_partition_1") ||
ERROR_INJECT_ERROR("fail_add_partition_1") ||
mysql_write_frm(lpt, WFRM_WRITE_SHADOW) ||
ERROR_INJECT_CRASH("crash_add_partition_2") ||
ERROR_INJECT_ERROR("fail_add_partition_2") ||
wait_while_table_is_used(thd, table, HA_EXTRA_NOT_USED) ||
ERROR_INJECT_CRASH("crash_add_partition_3") ||
ERROR_INJECT_ERROR("fail_add_partition_3") ||
(close_table_on_failure= TRUE, FALSE) ||
write_log_add_change_partition(lpt) ||
ERROR_INJECT_CRASH("crash_add_partition_4") ||
ERROR_INJECT_ERROR("fail_add_partition_4") ||
mysql_change_partitions(lpt) ||
ERROR_INJECT_CRASH("crash_add_partition_5") ||
ERROR_INJECT_ERROR("fail_add_partition_5") ||
(close_table_on_failure= FALSE, FALSE) ||
alter_close_table(lpt) ||
ERROR_INJECT_CRASH("crash_add_partition_6") ||
ERROR_INJECT_ERROR("fail_add_partition_6") ||
((!thd->lex->no_write_to_binlog) &&
(write_bin_log(thd, FALSE,
thd->query(), thd->query_length()), FALSE)) ||
ERROR_INJECT_CRASH("crash_add_partition_7") ||
ERROR_INJECT_ERROR("fail_add_partition_7") ||
write_log_rename_frm(lpt) ||
(action_completed= TRUE, FALSE) ||
ERROR_INJECT_CRASH("crash_add_partition_8") ||
ERROR_INJECT_ERROR("fail_add_partition_8") ||
(frm_install= TRUE, FALSE) ||
mysql_write_frm(lpt, WFRM_INSTALL_SHADOW) ||
(frm_install= FALSE, FALSE) ||
ERROR_INJECT_CRASH("crash_add_partition_9") ||
ERROR_INJECT_ERROR("fail_add_partition_9") ||
(write_log_completed(lpt, FALSE), FALSE) ||
ERROR_INJECT_CRASH("crash_add_partition_10") ||
ERROR_INJECT_ERROR("fail_add_partition_10") ||
(alter_partition_lock_handling(lpt), FALSE))
{
handle_alter_part_error(lpt, action_completed, FALSE, frm_install,
close_table_on_failure);
goto err;
}
}
else
{
/*
ADD HASH PARTITION/
COALESCE PARTITION/
REBUILD PARTITION/
REORGANIZE PARTITION
In this case all records are still around after the change although
possibly organised into new partitions, thus by ensuring that all
updates go to both the old and the new partitioning scheme we can
actually perform this operation lock-free. The only exception to
this is when REORGANIZE PARTITION adds/drops ranges. In this case
there needs to be an exclusive lock during the time when the range
changes occur.
This is only possible if the handler can ensure double-write for a
period. The double write will ensure that it doesn't matter where the
data is read from since both places are updated for writes. If such
double writing is not performed then it is necessary to perform the
change with the usual exclusive lock. With double writes it is even
possible to perform writes in parallel with the reorganisation of
partitions.
Without double write procedure we get the following procedure.
The only difference with using double write is that we can downgrade
the lock to TL_WRITE_ALLOW_WRITE. Double write in this case only
double writes from old to new. If we had double writing in both
directions we could perform the change completely without exclusive
lock for HASH partitions.
Handlers that perform double writing during the copy phase can actually
use a lower lock level. This can be handled inside store_lock in the
respective handler.
0) Write an entry that removes the shadow frm file if crash occurs.
1) Write the shadow frm file of new partitioning.
2) Log such that temporary partitions added in change phase are
removed in a crash situation.
3) Add the new partitions.
Copy from the reorganised partitions to the new partitions.
4) Get an exclusive metadata lock on the table (waits for all active
transactions using this table). This ensures that we
can release all other locks on the table and since no one can open
the table, there can be no new threads accessing the table. They
will be hanging on this exclusive lock.
5) Close the table.
6) Log that operation is completed and log all complete actions
needed to complete operation from here.
7) Write bin log.
8) Prepare handlers for rename and delete of partitions.
9) Rename and drop the reorged partitions such that they are no
longer used and rename those added to their real new names.
10) Install the shadow frm file.
11) Reopen the table if under lock tables.
12) Complete query.
*/
if (write_log_drop_shadow_frm(lpt) ||
ERROR_INJECT_CRASH("crash_change_partition_1") ||
ERROR_INJECT_ERROR("fail_change_partition_1") ||
mysql_write_frm(lpt, WFRM_WRITE_SHADOW) ||
ERROR_INJECT_CRASH("crash_change_partition_2") ||
ERROR_INJECT_ERROR("fail_change_partition_2") ||
(close_table_on_failure= TRUE, FALSE) ||
write_log_add_change_partition(lpt) ||
ERROR_INJECT_CRASH("crash_change_partition_3") ||
ERROR_INJECT_ERROR("fail_change_partition_3") ||
mysql_change_partitions(lpt) ||
ERROR_INJECT_CRASH("crash_change_partition_4") ||
ERROR_INJECT_ERROR("fail_change_partition_4") ||
wait_while_table_is_used(thd, table, HA_EXTRA_NOT_USED) ||
ERROR_INJECT_CRASH("crash_change_partition_5") ||
ERROR_INJECT_ERROR("fail_change_partition_5") ||
alter_close_table(lpt) ||
(close_table_on_failure= FALSE, FALSE) ||
ERROR_INJECT_CRASH("crash_change_partition_6") ||
ERROR_INJECT_ERROR("fail_change_partition_6") ||
write_log_final_change_partition(lpt) ||
(action_completed= TRUE, FALSE) ||
ERROR_INJECT_CRASH("crash_change_partition_7") ||
ERROR_INJECT_ERROR("fail_change_partition_7") ||
((!thd->lex->no_write_to_binlog) &&
(write_bin_log(thd, FALSE,
thd->query(), thd->query_length()), FALSE)) ||
ERROR_INJECT_CRASH("crash_change_partition_8") ||
ERROR_INJECT_ERROR("fail_change_partition_8") ||
((frm_install= TRUE), FALSE) ||
mysql_write_frm(lpt, WFRM_INSTALL_SHADOW) ||
(frm_install= FALSE, FALSE) ||
ERROR_INJECT_CRASH("crash_change_partition_9") ||
ERROR_INJECT_ERROR("fail_change_partition_9") ||
mysql_drop_partitions(lpt) ||
ERROR_INJECT_CRASH("crash_change_partition_10") ||
ERROR_INJECT_ERROR("fail_change_partition_10") ||
mysql_rename_partitions(lpt) ||
ERROR_INJECT_CRASH("crash_change_partition_11") ||
ERROR_INJECT_ERROR("fail_change_partition_11") ||
(write_log_completed(lpt, FALSE), FALSE) ||
ERROR_INJECT_CRASH("crash_change_partition_12") ||
ERROR_INJECT_ERROR("fail_change_partition_12") ||
(alter_partition_lock_handling(lpt), FALSE))
{
handle_alter_part_error(lpt, action_completed, FALSE, frm_install,
close_table_on_failure);
goto err;
}
}
downgrade_mdl_if_lock_tables_mode(thd, mdl_ticket, MDL_SHARED_NO_READ_WRITE);
/*
A final step is to write the query to the binlog and send ok to the
user
*/
DBUG_RETURN(fast_end_partition(thd, lpt->copied, lpt->deleted, table_list));
err:
downgrade_mdl_if_lock_tables_mode(thd, mdl_ticket, MDL_SHARED_NO_READ_WRITE);
DBUG_RETURN(TRUE);
}
#endif
/*
Prepare for calling val_int on partition function by setting fields to
point to the record where the values of the PF-fields are stored.
This variant works on a key_part reference.
It is not required that all fields are NOT NULL fields.
SYNOPSIS
set_key_field_ptr()
key_info key info with a set of fields to change ptr
new_buf New record pointer
old_buf Old record pointer
DESCRIPTION
Set ptr in field objects of field array to refer to new_buf record
instead of previously old_buf. Used before calling val_int and after
it is used to restore pointers to table->record[0].
This routine is placed outside of partition code since it can be useful
also for other programs.
*/
void set_key_field_ptr(KEY *key_info, const uchar *new_buf,
const uchar *old_buf)
{
KEY_PART_INFO *key_part= key_info->key_part;
uint key_parts= key_info->user_defined_key_parts;
uint i= 0;
my_ptrdiff_t diff= (new_buf - old_buf);
DBUG_ENTER("set_key_field_ptr");
do
{
key_part->field->move_field_offset(diff);
key_part++;
} while (++i < key_parts);
DBUG_VOID_RETURN;
}
/*
SYNOPSIS
mem_alloc_error()
size Size of memory attempted to allocate
None
RETURN VALUES
None
DESCRIPTION
A routine to use for all the many places in the code where memory
allocation error can happen, a tremendous amount of them, needs
simple routine that signals this error.
*/
void mem_alloc_error(size_t size)
{
my_error(ER_OUTOFMEMORY, MYF(ME_FATALERROR),
static_cast<int>(size));
}
#ifdef WITH_PARTITION_STORAGE_ENGINE
/**
Return comma-separated list of used partitions in the provided given string.
@param mem_root Where to allocate following list
@param part_info Partitioning info
@param[out] parts The resulting list of string to fill
@param[out] used_partitions_list result list to fill
Generate a list of used partitions (from bits in part_info->read_partitions
bitmap), and store it into the provided String object.
@note
The produced string must not be longer then MAX_PARTITIONS * (1 + FN_LEN).
In case of UPDATE, only the partitions read is given, not the partitions
that was written or locked.
*/
void make_used_partitions_str(MEM_ROOT *alloc,
partition_info *part_info,
String *parts_str,
String_list &used_partitions_list)
{
parts_str->length(0);
partition_element *pe;
uint partition_id= 0;
List_iterator<partition_element> it(part_info->partitions);
if (part_info->is_sub_partitioned())
{
partition_element *head_pe;
while ((head_pe= it++))
{
List_iterator<partition_element> it2(head_pe->subpartitions);
while ((pe= it2++))
{
if (bitmap_is_set(&part_info->read_partitions, partition_id))
{
if (parts_str->length())
parts_str->append(',');
uint index= parts_str->length();
parts_str->append(head_pe->partition_name,
strlen(head_pe->partition_name),
system_charset_info);
parts_str->append('_');
parts_str->append(pe->partition_name,
strlen(pe->partition_name),
system_charset_info);
used_partitions_list.append_str(alloc, parts_str->ptr() + index);
}
partition_id++;
}
}
}
else
{
while ((pe= it++))
{
if (bitmap_is_set(&part_info->read_partitions, partition_id))
{
if (parts_str->length())
parts_str->append(',');
used_partitions_list.append_str(alloc, pe->partition_name);
parts_str->append(pe->partition_name, strlen(pe->partition_name),
system_charset_info);
}
partition_id++;
}
}
}
#endif
/****************************************************************************
* Partition interval analysis support
***************************************************************************/
/*
Setup partition_info::* members related to partitioning range analysis
SYNOPSIS
set_up_partition_func_pointers()
part_info Partitioning info structure
DESCRIPTION
Assuming that passed partition_info structure already has correct values
for members that specify [sub]partitioning type, table fields, and
functions, set up partition_info::* members that are related to
Partitioning Interval Analysis (see get_partitions_in_range_iter for its
definition)
IMPLEMENTATION
There are three available interval analyzer functions:
(1) get_part_iter_for_interval_via_mapping
(2) get_part_iter_for_interval_cols_via_map
(3) get_part_iter_for_interval_via_walking
They all have limited applicability:
(1) is applicable for "PARTITION BY <RANGE|LIST>(func(t.field))", where
func is a monotonic function.
(2) is applicable for "PARTITION BY <RANGE|LIST> COLUMNS (field_list)
(3) is applicable for
"[SUB]PARTITION BY <any-partitioning-type>(any_func(t.integer_field))"
If both (1) and (3) are applicable, (1) is preferred over (3).
This function sets part_info::get_part_iter_for_interval according to
this criteria, and also sets some auxilary fields that the function
uses.
*/
#ifdef WITH_PARTITION_STORAGE_ENGINE
static void set_up_range_analysis_info(partition_info *part_info)
{
/* Set the catch-all default */
part_info->get_part_iter_for_interval= NULL;
part_info->get_subpart_iter_for_interval= NULL;
/*
Check if get_part_iter_for_interval_via_mapping() can be used for
partitioning
*/
switch (part_info->part_type) {
case RANGE_PARTITION:
case LIST_PARTITION:
if (!part_info->column_list)
{
if (part_info->part_expr->get_monotonicity_info() != NON_MONOTONIC)
{
part_info->get_part_iter_for_interval=
get_part_iter_for_interval_via_mapping;
goto setup_subparts;
}
}
else
{
part_info->get_part_iter_for_interval=
get_part_iter_for_interval_cols_via_map;
goto setup_subparts;
}
default:
;
}
/*
Check if get_part_iter_for_interval_via_walking() can be used for
partitioning
*/
if (part_info->num_part_fields == 1)
{
Field *field= part_info->part_field_array[0];
switch (field->type()) {
case MYSQL_TYPE_TINY:
case MYSQL_TYPE_SHORT:
case MYSQL_TYPE_INT24:
case MYSQL_TYPE_LONG:
case MYSQL_TYPE_LONGLONG:
part_info->get_part_iter_for_interval=
get_part_iter_for_interval_via_walking;
break;
default:
;
}
}
setup_subparts:
/*
Check if get_part_iter_for_interval_via_walking() can be used for
subpartitioning
*/
if (part_info->num_subpart_fields == 1)
{
Field *field= part_info->subpart_field_array[0];
switch (field->type()) {
case MYSQL_TYPE_TINY:
case MYSQL_TYPE_SHORT:
case MYSQL_TYPE_LONG:
case MYSQL_TYPE_LONGLONG:
part_info->get_subpart_iter_for_interval=
get_part_iter_for_interval_via_walking;
break;
default:
;
}
}
}
/*
This function takes a memory of packed fields in opt-range format
and stores it in record format. To avoid having to worry about how
the length of fields are calculated in opt-range format we send
an array of lengths used for each field in store_length_array.
SYNOPSIS
store_tuple_to_record()
pfield Field array
store_length_array Array of field lengths
value Memory where fields are stored
value_end End of memory
RETURN VALUE
nparts Number of fields assigned
*/
uint32 store_tuple_to_record(Field **pfield,
uint32 *store_length_array,
uchar *value,
uchar *value_end)
{
/* This function is inspired by store_key_image_rec. */
uint32 nparts= 0;
uchar *loc_value;
while (value < value_end)
{
loc_value= value;
if ((*pfield)->real_maybe_null())
{
if (*loc_value)
(*pfield)->set_null();
else
(*pfield)->set_notnull();
loc_value++;
}
uint len= (*pfield)->pack_length();
(*pfield)->set_key_image(loc_value, len);
value+= *store_length_array;
store_length_array++;
nparts++;
pfield++;
}
return nparts;
}
/**
RANGE(columns) partitioning: compare partition value bound and probe tuple.
@param val Partition column values.
@param nvals_in_rec Number of (prefix) fields to compare.
@return Less than/Equal to/Greater than 0 if the record is L/E/G than val.
@note The partition value bound is always a full tuple (but may include the
MAXVALUE special value). The probe tuple may be a prefix of partitioning
tuple.
*/
static int cmp_rec_and_tuple(part_column_list_val *val, uint32 nvals_in_rec)
{
partition_info *part_info= val->part_info;
Field **field= part_info->part_field_array;
Field **fields_end= field + nvals_in_rec;
int res;
for (; field != fields_end; field++, val++)
{
if (val->max_value)
return -1;
if ((*field)->is_null())
{
if (val->null_value)
continue;
return -1;
}
if (val->null_value)
return +1;
res= (*field)->cmp((const uchar*)val->column_value);
if (res)
return res;
}
return 0;
}
/**
Compare record and columns partition tuple including endpoint handling.
@param val Columns partition tuple
@param n_vals_in_rec Number of columns to compare
@param is_left_endpoint True if left endpoint (part_tuple < rec or
part_tuple <= rec)
@param include_endpoint If endpoint is included (part_tuple <= rec or
rec <= part_tuple)
@return Less than/Equal to/Greater than 0 if the record is L/E/G than
the partition tuple.
@see get_list_array_idx_for_endpoint() and
get_partition_id_range_for_endpoint().
*/
static int cmp_rec_and_tuple_prune(part_column_list_val *val,
uint32 n_vals_in_rec,
bool is_left_endpoint,
bool include_endpoint)
{
int cmp;
Field **field;
if ((cmp= cmp_rec_and_tuple(val, n_vals_in_rec)))
return cmp;
field= val->part_info->part_field_array + n_vals_in_rec;
if (!(*field))
{
/* Full match. Only equal if including endpoint. */
if (include_endpoint)
return 0;
if (is_left_endpoint)
return +4; /* Start of range, part_tuple < rec, return higher. */
return -4; /* End of range, rec < part_tupe, return lesser. */
}
/*
The prefix is equal and there are more partition columns to compare.
If including left endpoint or not including right endpoint
then the record is considered lesser compared to the partition.
i.e:
part(10, x) <= rec(10, unknown) and rec(10, unknown) < part(10, x)
part <= rec -> lesser (i.e. this or previous partitions)
rec < part -> lesser (i.e. this or previous partitions)
*/
if (is_left_endpoint == include_endpoint)
return -2;
/*
If right endpoint and the first additional partition value
is MAXVALUE, then the record is lesser.
*/
if (!is_left_endpoint && (val + n_vals_in_rec)->max_value)
return -3;
/*
Otherwise the record is considered greater.
rec <= part -> greater (i.e. does not match this partition, seek higher).
part < rec -> greater (i.e. does not match this partition, seek higher).
*/
return 2;
}
typedef uint32 (*get_endpoint_func)(partition_info*, bool left_endpoint,
bool include_endpoint);
typedef uint32 (*get_col_endpoint_func)(partition_info*, bool left_endpoint,
bool include_endpoint,
uint32 num_parts);
/**
Get partition for RANGE COLUMNS endpoint.
@param part_info Partitioning metadata.
@param is_left_endpoint True if left endpoint (const <=/< cols)
@param include_endpoint True if range includes the endpoint (<=/>=)
@param nparts Total number of partitions
@return Partition id of matching partition.
@see get_partition_id_cols_list_for_endpoint and
get_partition_id_range_for_endpoint.
*/
uint32 get_partition_id_cols_range_for_endpoint(partition_info *part_info,
bool is_left_endpoint,
bool include_endpoint,
uint32 nparts)
{
uint min_part_id= 0, max_part_id= part_info->num_parts, loc_part_id;
part_column_list_val *range_col_array= part_info->range_col_array;
uint num_columns= part_info->part_field_list.elements;
DBUG_ENTER("get_partition_id_cols_range_for_endpoint");
/* Find the matching partition (including taking endpoint into account). */
do
{
/* Midpoint, adjusted down, so it can never be > last partition. */
loc_part_id= (max_part_id + min_part_id) >> 1;
if (0 <= cmp_rec_and_tuple_prune(range_col_array +
loc_part_id * num_columns,
nparts,
is_left_endpoint,
include_endpoint))
min_part_id= loc_part_id + 1;
else
max_part_id= loc_part_id;
} while (max_part_id > min_part_id);
loc_part_id= max_part_id;
/* Given value must be LESS THAN the found partition. */
DBUG_ASSERT(loc_part_id == part_info->num_parts ||
(0 > cmp_rec_and_tuple_prune(range_col_array +
loc_part_id * num_columns,
nparts, is_left_endpoint,
include_endpoint)));
/* Given value must be GREATER THAN or EQUAL to the previous partition. */
DBUG_ASSERT(loc_part_id == 0 ||
(0 <= cmp_rec_and_tuple_prune(range_col_array +
(loc_part_id - 1) * num_columns,
nparts, is_left_endpoint,
include_endpoint)));
if (!is_left_endpoint)
{
/* Set the end after this partition if not already after the last. */
if (loc_part_id < part_info->num_parts)
loc_part_id++;
}
DBUG_RETURN(loc_part_id);
}
int get_part_iter_for_interval_cols_via_map(partition_info *part_info,
bool is_subpart,
uint32 *store_length_array,
uchar *min_value, uchar *max_value,
uint min_len, uint max_len,
uint flags,
PARTITION_ITERATOR *part_iter)
{
bool can_match_multiple_values;
uint32 nparts;
get_col_endpoint_func UNINIT_VAR(get_col_endpoint);
uint full_length= 0;
DBUG_ENTER("get_part_iter_for_interval_cols_via_map");
if (part_info->part_type == RANGE_PARTITION)
{
get_col_endpoint= get_partition_id_cols_range_for_endpoint;
part_iter->get_next= get_next_partition_id_range;
}
else if (part_info->part_type == LIST_PARTITION)
{
if (part_info->has_default_partititon() &&
part_info->num_parts == 1)
DBUG_RETURN(-1); //only DEFAULT partition
get_col_endpoint= get_partition_id_cols_list_for_endpoint;
part_iter->get_next= get_next_partition_id_list;
part_iter->part_info= part_info;
DBUG_ASSERT(part_info->num_list_values);
}
else
assert(0);
for (uint32 i= 0; i < part_info->num_columns; i++)
full_length+= store_length_array[i];
can_match_multiple_values= ((flags &
(NO_MIN_RANGE | NO_MAX_RANGE | NEAR_MIN |
NEAR_MAX)) ||
(min_len != max_len) ||
(min_len != full_length) ||
memcmp(min_value, max_value, min_len));
DBUG_ASSERT(can_match_multiple_values || (flags & EQ_RANGE) || flags == 0);
if (can_match_multiple_values && part_info->has_default_partititon())
part_iter->ret_default_part= part_iter->ret_default_part_orig= TRUE;
if (flags & NO_MIN_RANGE)
part_iter->part_nums.start= part_iter->part_nums.cur= 0;
else
{
// Copy from min_value to record
nparts= store_tuple_to_record(part_info->part_field_array,
store_length_array,
min_value,
min_value + min_len);
part_iter->part_nums.start= part_iter->part_nums.cur=
get_col_endpoint(part_info, TRUE, !(flags & NEAR_MIN),
nparts);
}
if (flags & NO_MAX_RANGE)
{
if (part_info->part_type == RANGE_PARTITION)
part_iter->part_nums.end= part_info->num_parts;
else /* LIST_PARTITION */
{
DBUG_ASSERT(part_info->part_type == LIST_PARTITION);
part_iter->part_nums.end= part_info->num_list_values;
}
}
else
{
// Copy from max_value to record
nparts= store_tuple_to_record(part_info->part_field_array,
store_length_array,
max_value,
max_value + max_len);
part_iter->part_nums.end= get_col_endpoint(part_info, FALSE,
!(flags & NEAR_MAX),
nparts);
}
if (part_iter->part_nums.start == part_iter->part_nums.end)
{
// No matching partition found.
if (part_info->has_default_partititon())
{
part_iter->ret_default_part= part_iter->ret_default_part_orig= TRUE;
DBUG_RETURN(1);
}
DBUG_RETURN(0);
}
DBUG_RETURN(1);
}
/**
Partitioning Interval Analysis: Initialize the iterator for "mapping" case
@param part_info Partition info
@param is_subpart TRUE - act for subpartitioning
FALSE - act for partitioning
@param store_length_array Ignored.
@param min_value minimum field value, in opt_range key format.
@param max_value minimum field value, in opt_range key format.
@param min_len Ignored.
@param max_len Ignored.
@param flags Some combination of NEAR_MIN, NEAR_MAX, NO_MIN_RANGE,
NO_MAX_RANGE.
@param part_iter Iterator structure to be initialized
@details Initialize partition set iterator to walk over the interval in
ordered-array-of-partitions (for RANGE partitioning) or
ordered-array-of-list-constants (for LIST partitioning) space.
This function is used when partitioning is done by
<RANGE|LIST>(ascending_func(t.field)), and we can map an interval in
t.field space into a sub-array of partition_info::range_int_array or
partition_info::list_array (see get_partition_id_range_for_endpoint,
get_list_array_idx_for_endpoint for details).
The function performs this interval mapping, and sets the iterator to
traverse the sub-array and return appropriate partitions.
@return Status of iterator
@retval 0 No matching partitions (iterator not initialized)
@retval 1 Ok, iterator intialized for traversal of matching partitions.
@retval -1 All partitions would match (iterator not initialized)
*/
int get_part_iter_for_interval_via_mapping(partition_info *part_info,
bool is_subpart,
uint32 *store_length_array, /* ignored */
uchar *min_value, uchar *max_value,
uint min_len, uint max_len, /* ignored */
uint flags,
PARTITION_ITERATOR *part_iter)
{
Field *field= part_info->part_field_array[0];
uint32 UNINIT_VAR(max_endpoint_val);
get_endpoint_func UNINIT_VAR(get_endpoint);
bool can_match_multiple_values; /* is not '=' */
uint field_len= field->pack_length_in_rec();
MYSQL_TIME start_date;
bool check_zero_dates= false;
bool zero_in_start_date= true;
DBUG_ENTER("get_part_iter_for_interval_via_mapping");
DBUG_ASSERT(!is_subpart);
(void) store_length_array;
(void)min_len;
(void)max_len;
part_iter->ret_null_part= part_iter->ret_null_part_orig= FALSE;
part_iter->ret_default_part= part_iter->ret_default_part_orig= FALSE;
if (part_info->part_type == RANGE_PARTITION)
{
if (part_info->part_charset_field_array)
get_endpoint= get_partition_id_range_for_endpoint_charset;
else
get_endpoint= get_partition_id_range_for_endpoint;
max_endpoint_val= part_info->num_parts;
part_iter->get_next= get_next_partition_id_range;
}
else if (part_info->part_type == LIST_PARTITION)
{
if (part_info->part_charset_field_array)
get_endpoint= get_list_array_idx_for_endpoint_charset;
else
get_endpoint= get_list_array_idx_for_endpoint;
max_endpoint_val= part_info->num_list_values;
part_iter->get_next= get_next_partition_id_list;
part_iter->part_info= part_info;
if (max_endpoint_val == 0)
{
/*
We handle this special case without optimisations since it is
of little practical value but causes a great number of complex
checks later in the code.
*/
part_iter->part_nums.start= part_iter->part_nums.end= 0;
part_iter->part_nums.cur= 0;
part_iter->ret_null_part= part_iter->ret_null_part_orig= TRUE;
DBUG_RETURN(-1);
}
}
else
MY_ASSERT_UNREACHABLE();
can_match_multiple_values= ((flags &
(NO_MIN_RANGE | NO_MAX_RANGE | NEAR_MIN |
NEAR_MAX)) ||
memcmp(min_value, max_value, field_len));
DBUG_ASSERT(can_match_multiple_values || (flags & EQ_RANGE) || flags == 0);
if (can_match_multiple_values && part_info->has_default_partititon())
part_iter->ret_default_part= part_iter->ret_default_part_orig= TRUE;
if (can_match_multiple_values &&
(part_info->part_type == RANGE_PARTITION ||
part_info->has_null_value))
{
/* Range scan on RANGE or LIST partitioned table */
enum_monotonicity_info monotonic;
monotonic= part_info->part_expr->get_monotonicity_info();
if (monotonic == MONOTONIC_INCREASING_NOT_NULL ||
monotonic == MONOTONIC_STRICT_INCREASING_NOT_NULL)
{
/* col is NOT NULL, but F(col) can return NULL, add NULL partition */
part_iter->ret_null_part= part_iter->ret_null_part_orig= TRUE;
check_zero_dates= true;
}
}
/*
Find minimum: Do special handling if the interval has left bound in form
" NULL <= X ":
*/
if (field->real_maybe_null() && part_info->has_null_value &&
!(flags & (NO_MIN_RANGE | NEAR_MIN)) && *min_value)
{
part_iter->ret_null_part= part_iter->ret_null_part_orig= TRUE;
part_iter->part_nums.start= part_iter->part_nums.cur= 0;
if (!(flags & NO_MAX_RANGE) && *max_value)
{
/* The right bound is X <= NULL, i.e. it is a "X IS NULL" interval */
part_iter->part_nums.end= 0;
/*
It is something like select * from tbl where col IS NULL
and we have partition with NULL to catch it, so we do not need
DEFAULT partition
*/
part_iter->ret_default_part= part_iter->ret_default_part_orig= FALSE;
DBUG_RETURN(1);
}
}
else
{
if (flags & NO_MIN_RANGE)
part_iter->part_nums.start= part_iter->part_nums.cur= 0;
else
{
/*
Store the interval edge in the record buffer, and call the
function that maps the edge in table-field space to an edge
in ordered-set-of-partitions (for RANGE partitioning) or
index-in-ordered-array-of-list-constants (for LIST) space.
*/
store_key_image_to_rec(field, min_value, field_len);
bool include_endp= !MY_TEST(flags & NEAR_MIN);
part_iter->part_nums.start= get_endpoint(part_info, 1, include_endp);
if (!can_match_multiple_values && part_info->part_expr->null_value)
{
/* col = x and F(x) = NULL -> only search NULL partition */
part_iter->part_nums.cur= part_iter->part_nums.start= 0;
part_iter->part_nums.end= 0;
/*
if NULL partition exists:
for RANGE it is the first partition (always exists);
for LIST should be indicator that it is present
*/
if (part_info->part_type == RANGE_PARTITION ||
part_info->has_null_value)
{
part_iter->ret_null_part= part_iter->ret_null_part_orig= TRUE;
DBUG_RETURN(1);
}
// If no NULL partition look up in DEFAULT or there is no such value
goto not_found;
}
part_iter->part_nums.cur= part_iter->part_nums.start;
if (check_zero_dates && !part_info->part_expr->null_value)
{
if (!(flags & NO_MAX_RANGE) &&
(field->type() == MYSQL_TYPE_DATE ||
field->type() == MYSQL_TYPE_DATETIME))
{
/* Monotonic, but return NULL for dates with zeros in month/day. */
zero_in_start_date= field->get_date(&start_date, 0);
DBUG_PRINT("info", ("zero start %u %04d-%02d-%02d",
zero_in_start_date, start_date.year,
start_date.month, start_date.day));
}
}
if (part_iter->part_nums.start == max_endpoint_val)
goto not_found;
}
}
/* Find maximum, do the same as above but for right interval bound */
if (flags & NO_MAX_RANGE)
part_iter->part_nums.end= max_endpoint_val;
else
{
store_key_image_to_rec(field, max_value, field_len);
bool include_endp= !MY_TEST(flags & NEAR_MAX);
part_iter->part_nums.end= get_endpoint(part_info, 0, include_endp);
if (check_zero_dates &&
!zero_in_start_date &&
!part_info->part_expr->null_value)
{
MYSQL_TIME end_date;
bool zero_in_end_date= field->get_date(&end_date, 0);
/*
This is an optimization for TO_DAYS()/TO_SECONDS() to avoid scanning
the NULL partition for ranges that cannot include a date with 0 as
month/day.
*/
DBUG_PRINT("info", ("zero end %u %04d-%02d-%02d",
zero_in_end_date,
end_date.year, end_date.month, end_date.day));
DBUG_ASSERT(!memcmp(((Item_func*) part_info->part_expr)->func_name(),
"to_days", 7) ||
!memcmp(((Item_func*) part_info->part_expr)->func_name(),
"to_seconds", 10));
if (!zero_in_end_date &&
start_date.month == end_date.month &&
start_date.year == end_date.year)
part_iter->ret_null_part= part_iter->ret_null_part_orig= false;
}
if (part_iter->part_nums.start >= part_iter->part_nums.end &&
!part_iter->ret_null_part)
goto not_found;
}
DBUG_RETURN(1); /* Ok, iterator initialized */
not_found:
if (part_info->has_default_partititon())
{
part_iter->ret_default_part= part_iter->ret_default_part_orig= TRUE;
DBUG_RETURN(1);
}
DBUG_RETURN(0); /* No partitions */
}
/* See get_part_iter_for_interval_via_walking for definition of what this is */
#define MAX_RANGE_TO_WALK 32
/*
Partitioning Interval Analysis: Initialize iterator to walk field interval
SYNOPSIS
get_part_iter_for_interval_via_walking()
part_info Partition info
is_subpart TRUE - act for subpartitioning
FALSE - act for partitioning
min_value minimum field value, in opt_range key format.
max_value minimum field value, in opt_range key format.
flags Some combination of NEAR_MIN, NEAR_MAX, NO_MIN_RANGE,
NO_MAX_RANGE.
part_iter Iterator structure to be initialized
DESCRIPTION
Initialize partition set iterator to walk over interval in integer field
space. That is, for "const1 <=? t.field <=? const2" interval, initialize
the iterator to return a set of [sub]partitions obtained with the
following procedure:
get partition id for t.field = const1, return it
get partition id for t.field = const1+1, return it
... t.field = const1+2, ...
... ... ...
... t.field = const2 ...
IMPLEMENTATION
See get_partitions_in_range_iter for general description of interval
analysis. We support walking over the following intervals:
"t.field IS NULL"
"c1 <=? t.field <=? c2", where c1 and c2 are finite.
Intervals with +inf/-inf, and [NULL, c1] interval can be processed but
that is more tricky and I don't have time to do it right now.
RETURN
0 - No matching partitions, iterator not initialized
1 - Some partitions would match, iterator intialized for traversing them
-1 - All partitions would match, iterator not initialized
*/
int get_part_iter_for_interval_via_walking(partition_info *part_info,
bool is_subpart,
uint32 *store_length_array, /* ignored */
uchar *min_value, uchar *max_value,
uint min_len, uint max_len, /* ignored */
uint flags,
PARTITION_ITERATOR *part_iter)
{
Field *field;
uint total_parts;
partition_iter_func get_next_func;
DBUG_ENTER("get_part_iter_for_interval_via_walking");
(void)store_length_array;
(void)min_len;
(void)max_len;
part_iter->ret_null_part= part_iter->ret_null_part_orig= FALSE;
part_iter->ret_default_part= part_iter->ret_default_part_orig= FALSE;
if (is_subpart)
{
field= part_info->subpart_field_array[0];
total_parts= part_info->num_subparts;
get_next_func= get_next_subpartition_via_walking;
}
else
{
field= part_info->part_field_array[0];
total_parts= part_info->num_parts;
get_next_func= get_next_partition_via_walking;
}
/* Handle the "t.field IS NULL" interval, it is a special case */
if (field->real_maybe_null() && !(flags & (NO_MIN_RANGE | NO_MAX_RANGE)) &&
*min_value && *max_value)
{
/*
We don't have a part_iter->get_next() function that would find which
partition "t.field IS NULL" belongs to, so find partition that contains
NULL right here, and return an iterator over singleton set.
*/
uint32 part_id;
field->set_null();
if (is_subpart)
{
if (!part_info->get_subpartition_id(part_info, &part_id))
{
init_single_partition_iterator(part_id, part_iter);
DBUG_RETURN(1); /* Ok, iterator initialized */
}
}
else
{
longlong dummy;
int res= part_info->is_sub_partitioned() ?
part_info->get_part_partition_id(part_info, &part_id,
&dummy):
part_info->get_partition_id(part_info, &part_id, &dummy);
if (!res)
{
init_single_partition_iterator(part_id, part_iter);
DBUG_RETURN(1); /* Ok, iterator initialized */
}
}
DBUG_RETURN(0); /* No partitions match */
}
if ((field->real_maybe_null() &&
((!(flags & NO_MIN_RANGE) && *min_value) || // NULL <? X
(!(flags & NO_MAX_RANGE) && *max_value))) || // X <? NULL
(flags & (NO_MIN_RANGE | NO_MAX_RANGE))) // -inf at any bound
{
DBUG_RETURN(-1); /* Can't handle this interval, have to use all partitions */
}
/* Get integers for left and right interval bound */
longlong a, b;
uint len= field->pack_length_in_rec();
store_key_image_to_rec(field, min_value, len);
a= field->val_int();
store_key_image_to_rec(field, max_value, len);
b= field->val_int();
/*
Handle a special case where the distance between interval bounds is
exactly 4G-1. This interval is too big for range walking, and if it is an
(x,y]-type interval then the following "b +=..." code will convert it to
an empty interval by "wrapping around" a + 4G-1 + 1 = a.
*/
if ((ulonglong)b - (ulonglong)a == ~0ULL)
DBUG_RETURN(-1);
a+= MY_TEST(flags & NEAR_MIN);
b+= MY_TEST(!(flags & NEAR_MAX));
ulonglong n_values= b - a;
/*
Will it pay off to enumerate all values in the [a..b] range and evaluate
the partitioning function for every value? It depends on
1. whether we'll be able to infer that some partitions are not used
2. if time savings from not scanning these partitions will be greater
than time spent in enumeration.
We will assume that the cost of accessing one extra partition is greater
than the cost of evaluating the partitioning function O(#partitions).
This means we should jump at any chance to eliminate a partition, which
gives us this logic:
Do the enumeration if
- the number of values to enumerate is comparable to the number of
partitions, or
- there are not many values to enumerate.
*/
if ((n_values > 2*total_parts) && n_values > MAX_RANGE_TO_WALK)
DBUG_RETURN(-1);
part_iter->field_vals.start= part_iter->field_vals.cur= a;
part_iter->field_vals.end= b;
part_iter->part_info= part_info;
part_iter->get_next= get_next_func;
DBUG_RETURN(1);
}
/*
PARTITION_ITERATOR::get_next implementation: enumerate partitions in range
SYNOPSIS
get_next_partition_id_range()
part_iter Partition set iterator structure
DESCRIPTION
This is implementation of PARTITION_ITERATOR::get_next() that returns
[sub]partition ids in [min_partition_id, max_partition_id] range.
The function conforms to partition_iter_func type.
RETURN
partition id
NOT_A_PARTITION_ID if there are no more partitions
*/
uint32 get_next_partition_id_range(PARTITION_ITERATOR* part_iter)
{
if (part_iter->part_nums.cur >= part_iter->part_nums.end)
{
if (part_iter->ret_null_part)
{
part_iter->ret_null_part= FALSE;
return 0; /* NULL always in first range partition */
}
// we do not have default partition in RANGE partitioning
DBUG_ASSERT(!part_iter->ret_default_part);
part_iter->part_nums.cur= part_iter->part_nums.start;
part_iter->ret_null_part= part_iter->ret_null_part_orig;
return NOT_A_PARTITION_ID;
}
else
return part_iter->part_nums.cur++;
}
/*
PARTITION_ITERATOR::get_next implementation for LIST partitioning
SYNOPSIS
get_next_partition_id_list()
part_iter Partition set iterator structure
DESCRIPTION
This implementation of PARTITION_ITERATOR::get_next() is special for
LIST partitioning: it enumerates partition ids in
part_info->list_array[i] (list_col_array[i*cols] for COLUMNS LIST
partitioning) where i runs over [min_idx, max_idx] interval.
The function conforms to partition_iter_func type.
RETURN
partition id
NOT_A_PARTITION_ID if there are no more partitions
*/
uint32 get_next_partition_id_list(PARTITION_ITERATOR *part_iter)
{
if (part_iter->part_nums.cur >= part_iter->part_nums.end)
{
if (part_iter->ret_null_part)
{
part_iter->ret_null_part= FALSE;
return part_iter->part_info->has_null_part_id;
}
if (part_iter->ret_default_part)
{
part_iter->ret_default_part= FALSE;
return part_iter->part_info->default_partition_id;
}
/* Reset partition for next read */
part_iter->part_nums.cur= part_iter->part_nums.start;
part_iter->ret_null_part= part_iter->ret_null_part_orig;
part_iter->ret_default_part= part_iter->ret_default_part_orig;
return NOT_A_PARTITION_ID;
}
else
{
partition_info *part_info= part_iter->part_info;
uint32 num_part= part_iter->part_nums.cur++;
if (part_info->column_list)
{
uint num_columns= part_info->part_field_list.elements;
return part_info->list_col_array[num_part*num_columns].partition_id;
}
return part_info->list_array[num_part].partition_id;
}
}
/*
PARTITION_ITERATOR::get_next implementation: walk over field-space interval
SYNOPSIS
get_next_partition_via_walking()
part_iter Partitioning iterator
DESCRIPTION
This implementation of PARTITION_ITERATOR::get_next() returns ids of
partitions that contain records with partitioning field value within
[start_val, end_val] interval.
The function conforms to partition_iter_func type.
RETURN
partition id
NOT_A_PARTITION_ID if there are no more partitioning.
*/
static uint32 get_next_partition_via_walking(PARTITION_ITERATOR *part_iter)
{
uint32 part_id;
Field *field= part_iter->part_info->part_field_array[0];
while (part_iter->field_vals.cur != part_iter->field_vals.end)
{
longlong dummy;
field->store(part_iter->field_vals.cur++, field->flags & UNSIGNED_FLAG);
if ((part_iter->part_info->is_sub_partitioned() &&
!part_iter->part_info->get_part_partition_id(part_iter->part_info,
&part_id, &dummy)) ||
!part_iter->part_info->get_partition_id(part_iter->part_info,
&part_id, &dummy))
return part_id;
}
part_iter->field_vals.cur= part_iter->field_vals.start;
return NOT_A_PARTITION_ID;
}
/* Same as get_next_partition_via_walking, but for subpartitions */
static uint32 get_next_subpartition_via_walking(PARTITION_ITERATOR *part_iter)
{
Field *field= part_iter->part_info->subpart_field_array[0];
uint32 res;
if (part_iter->field_vals.cur == part_iter->field_vals.end)
{
part_iter->field_vals.cur= part_iter->field_vals.start;
return NOT_A_PARTITION_ID;
}
field->store(part_iter->field_vals.cur++, field->flags & UNSIGNED_FLAG);
if (part_iter->part_info->get_subpartition_id(part_iter->part_info,
&res))
return NOT_A_PARTITION_ID;
return res;
}
/*
Create partition names
SYNOPSIS
create_partition_name()
out:out Created partition name string
in1 First part
in2 Second part
name_variant Normal, temporary or renamed partition name
RETURN VALUE
NONE
DESCRIPTION
This method is used to calculate the partition name, service routine to
the del_ren_cre_table method.
*/
void create_partition_name(char *out, const char *in1,
const char *in2, uint name_variant,
bool translate)
{
char transl_part_name[FN_REFLEN];
const char *transl_part;
if (translate)
{
tablename_to_filename(in2, transl_part_name, FN_REFLEN);
transl_part= transl_part_name;
}
else
transl_part= in2;
if (name_variant == NORMAL_PART_NAME)
strxmov(out, in1, "#P#", transl_part, NullS);
else if (name_variant == TEMP_PART_NAME)
strxmov(out, in1, "#P#", transl_part, "#TMP#", NullS);
else if (name_variant == RENAMED_PART_NAME)
strxmov(out, in1, "#P#", transl_part, "#REN#", NullS);
}
/*
Create subpartition name
SYNOPSIS
create_subpartition_name()
out:out Created partition name string
in1 First part
in2 Second part
in3 Third part
name_variant Normal, temporary or renamed partition name
RETURN VALUE
NONE
DESCRIPTION
This method is used to calculate the subpartition name, service routine to
the del_ren_cre_table method.
*/
void create_subpartition_name(char *out, const char *in1,
const char *in2, const char *in3,
uint name_variant)
{
char transl_part_name[FN_REFLEN], transl_subpart_name[FN_REFLEN];
tablename_to_filename(in2, transl_part_name, FN_REFLEN);
tablename_to_filename(in3, transl_subpart_name, FN_REFLEN);
if (name_variant == NORMAL_PART_NAME)
strxmov(out, in1, "#P#", transl_part_name,
"#SP#", transl_subpart_name, NullS);
else if (name_variant == TEMP_PART_NAME)
strxmov(out, in1, "#P#", transl_part_name,
"#SP#", transl_subpart_name, "#TMP#", NullS);
else if (name_variant == RENAMED_PART_NAME)
strxmov(out, in1, "#P#", transl_part_name,
"#SP#", transl_subpart_name, "#REN#", NullS);
}
uint get_partition_field_store_length(Field *field)
{
uint store_length;
store_length= field->key_length();
if (field->real_maybe_null())
store_length+= HA_KEY_NULL_LENGTH;
if (field->real_type() == MYSQL_TYPE_VARCHAR)
store_length+= HA_KEY_BLOB_LENGTH;
return store_length;
}
#endif
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