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mariadb/sql/sql_select.h
Alexander Nozdrin bd60794fd8 Merge from mysql-trunk-merge.
2009-10-19 17:36:19 +04:00

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/* Copyright (C) 2000-2006 MySQL 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/**
@file
@brief
classes to use when handling where clause
*/
#ifdef USE_PRAGMA_INTERFACE
#pragma interface /* gcc class implementation */
#endif
#include "procedure.h"
#include <myisam.h>
typedef struct keyuse_t {
TABLE *table;
Item *val; /**< or value if no field */
table_map used_tables;
uint key, keypart, optimize;
key_part_map keypart_map;
ha_rows ref_table_rows;
/**
If true, the comparison this value was created from will not be
satisfied if val has NULL 'value'.
*/
bool null_rejecting;
/*
!NULL - This KEYUSE was created from an equality that was wrapped into
an Item_func_trig_cond. This means the equality (and validity of
this KEYUSE element) can be turned on and off. The on/off state
is indicted by the pointed value:
*cond_guard == TRUE <=> equality condition is on
*cond_guard == FALSE <=> equality condition is off
NULL - Otherwise (the source equality can't be turned off)
*/
bool *cond_guard;
} KEYUSE;
class store_key;
typedef struct st_table_ref
{
bool key_err;
uint key_parts; ///< num of ...
uint key_length; ///< length of key_buff
int key; ///< key no
uchar *key_buff; ///< value to look for with key
uchar *key_buff2; ///< key_buff+key_length
store_key **key_copy; //
Item **items; ///< val()'s for each keypart
/*
Array of pointers to trigger variables. Some/all of the pointers may be
NULL. The ref access can be used iff
for each used key part i, (!cond_guards[i] || *cond_guards[i])
This array is used by subquery code. The subquery code may inject
triggered conditions, i.e. conditions that can be 'switched off'. A ref
access created from such condition is not valid when at least one of the
underlying conditions is switched off (see subquery code for more details)
*/
bool **cond_guards;
/**
(null_rejecting & (1<<i)) means the condition is '=' and no matching
rows will be produced if items[i] IS NULL (see add_not_null_conds())
*/
key_part_map null_rejecting;
table_map depend_map; ///< Table depends on these tables.
/* null byte position in the key_buf. Used for REF_OR_NULL optimization */
uchar *null_ref_key;
} TABLE_REF;
/**
CACHE_FIELD and JOIN_CACHE is used on full join to cache records in outer
table
*/
typedef struct st_cache_field {
uchar *str;
uint length, blob_length;
Field_blob *blob_field;
bool strip;
} CACHE_FIELD;
typedef struct st_join_cache {
uchar *buff,*pos,*end;
uint records,record_nr,ptr_record,fields,length,blobs;
CACHE_FIELD *field,**blob_ptr;
SQL_SELECT *select;
} JOIN_CACHE;
/*
The structs which holds the join connections and join states
*/
enum join_type { JT_UNKNOWN,JT_SYSTEM,JT_CONST,JT_EQ_REF,JT_REF,JT_MAYBE_REF,
JT_ALL, JT_RANGE, JT_NEXT, JT_FT, JT_REF_OR_NULL,
JT_UNIQUE_SUBQUERY, JT_INDEX_SUBQUERY, JT_INDEX_MERGE};
class JOIN;
enum enum_nested_loop_state
{
NESTED_LOOP_KILLED= -2, NESTED_LOOP_ERROR= -1,
NESTED_LOOP_OK= 0, NESTED_LOOP_NO_MORE_ROWS= 1,
NESTED_LOOP_QUERY_LIMIT= 3, NESTED_LOOP_CURSOR_LIMIT= 4
};
/* Values for JOIN_TAB::packed_info */
#define TAB_INFO_HAVE_VALUE 1
#define TAB_INFO_USING_INDEX 2
#define TAB_INFO_USING_WHERE 4
#define TAB_INFO_FULL_SCAN_ON_NULL 8
typedef enum_nested_loop_state
(*Next_select_func)(JOIN *, struct st_join_table *, bool);
typedef int (*Read_record_func)(struct st_join_table *tab);
Next_select_func setup_end_select_func(JOIN *join);
typedef struct st_join_table {
st_join_table() {} /* Remove gcc warning */
TABLE *table;
KEYUSE *keyuse; /**< pointer to first used key */
SQL_SELECT *select;
COND *select_cond;
QUICK_SELECT_I *quick;
Item **on_expr_ref; /**< pointer to the associated on expression */
COND_EQUAL *cond_equal; /**< multiple equalities for the on expression */
st_join_table *first_inner; /**< first inner table for including outerjoin */
bool found; /**< true after all matches or null complement */
bool not_null_compl;/**< true before null complement is added */
st_join_table *last_inner; /**< last table table for embedding outer join */
st_join_table *first_upper; /**< first inner table for embedding outer join */
st_join_table *first_unmatched; /**< used for optimization purposes only */
/* Special content for EXPLAIN 'Extra' column or NULL if none */
const char *info;
/*
Bitmap of TAB_INFO_* bits that encodes special line for EXPLAIN 'Extra'
column, or 0 if there is no info.
*/
uint packed_info;
Read_record_func read_first_record;
Next_select_func next_select;
READ_RECORD read_record;
/*
Currently the following two fields are used only for a [NOT] IN subquery
if it is executed by an alternative full table scan when the left operand of
the subquery predicate is evaluated to NULL.
*/
Read_record_func save_read_first_record;/* to save read_first_record */
int (*save_read_record) (READ_RECORD *);/* to save read_record.read_record */
double worst_seeks;
key_map const_keys; /**< Keys with constant part */
key_map checked_keys; /**< Keys checked in find_best */
key_map needed_reg;
key_map keys; /**< all keys with can be used */
/* Either #rows in the table or 1 for const table. */
ha_rows records;
/*
Number of records that will be scanned (yes scanned, not returned) by the
best 'independent' access method, i.e. table scan or QUICK_*_SELECT)
*/
ha_rows found_records;
/*
Cost of accessing the table using "ALL" or range/index_merge access
method (but not 'index' for some reason), i.e. this matches method which
E(#records) is in found_records.
*/
ha_rows read_time;
table_map dependent,key_dependent;
uint use_quick,index;
uint status; ///< Save status for cache
uint used_fields,used_fieldlength,used_blobs;
enum join_type type;
bool cached_eq_ref_table,eq_ref_table,not_used_in_distinct;
bool sorted;
/*
If it's not 0 the number stored this field indicates that the index
scan has been chosen to access the table data and we expect to scan
this number of rows for the table.
*/
ha_rows limit;
TABLE_REF ref;
JOIN_CACHE cache;
JOIN *join;
/** Bitmap of nested joins this table is part of */
nested_join_map embedding_map;
void cleanup();
inline bool is_using_loose_index_scan()
{
return (select && select->quick &&
(select->quick->get_type() ==
QUICK_SELECT_I::QS_TYPE_GROUP_MIN_MAX));
}
bool is_using_agg_loose_index_scan ()
{
return (is_using_loose_index_scan() &&
((QUICK_GROUP_MIN_MAX_SELECT *)select->quick)->is_agg_distinct());
}
} JOIN_TAB;
enum_nested_loop_state sub_select_cache(JOIN *join, JOIN_TAB *join_tab, bool
end_of_records);
enum_nested_loop_state sub_select(JOIN *join,JOIN_TAB *join_tab, bool
end_of_records);
/**
Information about a position of table within a join order. Used in join
optimization.
*/
typedef struct st_position
{
/*
The "fanout": number of output rows that will be produced (after
pushed down selection condition is applied) per each row combination of
previous tables.
*/
double records_read;
/*
Cost accessing the table in course of the entire complete join execution,
i.e. cost of one access method use (e.g. 'range' or 'ref' scan ) times
number the access method will be invoked.
*/
double read_time;
JOIN_TAB *table;
/*
NULL - 'index' or 'range' or 'index_merge' or 'ALL' access is used.
Other - [eq_]ref[_or_null] access is used. Pointer to {t.keypart1 = expr}
*/
KEYUSE *key;
/* If ref-based access is used: bitmap of tables this table depends on */
table_map ref_depend_map;
} POSITION;
typedef struct st_rollup
{
enum State { STATE_NONE, STATE_INITED, STATE_READY };
State state;
Item_null_result **null_items;
Item ***ref_pointer_arrays;
List<Item> *fields;
} ROLLUP;
class JOIN :public Sql_alloc
{
JOIN(const JOIN &rhs); /**< not implemented */
JOIN& operator=(const JOIN &rhs); /**< not implemented */
public:
JOIN_TAB *join_tab,**best_ref;
JOIN_TAB **map2table; ///< mapping between table indexes and JOIN_TABs
JOIN_TAB *join_tab_save; ///< saved join_tab for subquery reexecution
TABLE **table,**all_tables,*sort_by_table;
uint tables,const_tables;
uint send_group_parts;
/**
Indicates that grouping will be performed on the result set during
query execution. This field belongs to query execution.
@see make_group_fields, alloc_group_fields, JOIN::exec
*/
bool sort_and_group;
bool first_record,full_join,group, no_field_update;
bool do_send_rows;
/**
TRUE when we want to resume nested loop iterations when
fetching data from a cursor
*/
bool resume_nested_loop;
table_map const_table_map,found_const_table_map;
/*
Bitmap of all inner tables from outer joins
*/
table_map outer_join;
ha_rows send_records,found_records,examined_rows,row_limit, select_limit;
/**
Used to fetch no more than given amount of rows per one
fetch operation of server side cursor.
The value is checked in end_send and end_send_group in fashion, similar
to offset_limit_cnt:
- fetch_limit= HA_POS_ERROR if there is no cursor.
- when we open a cursor, we set fetch_limit to 0,
- on each fetch iteration we add num_rows to fetch to fetch_limit
*/
ha_rows fetch_limit;
POSITION positions[MAX_TABLES+1],best_positions[MAX_TABLES+1];
/* *
Bitmap of nested joins embedding the position at the end of the current
partial join (valid only during join optimizer run).
*/
nested_join_map cur_embedding_map;
double best_read;
List<Item> *fields;
List<Cached_item> group_fields, group_fields_cache;
TABLE *tmp_table;
/// used to store 2 possible tmp table of SELECT
TABLE *exec_tmp_table1, *exec_tmp_table2;
THD *thd;
Item_sum **sum_funcs, ***sum_funcs_end;
/** second copy of sumfuncs (for queries with 2 temporary tables */
Item_sum **sum_funcs2, ***sum_funcs_end2;
Procedure *procedure;
Item *having;
Item *tmp_having; ///< To store having when processed temporary table
Item *having_history; ///< Store having for explain
ulonglong select_options;
select_result *result;
TMP_TABLE_PARAM tmp_table_param;
MYSQL_LOCK *lock;
/// unit structure (with global parameters) for this select
SELECT_LEX_UNIT *unit;
/// select that processed
SELECT_LEX *select_lex;
/**
TRUE <=> optimizer must not mark any table as a constant table.
This is needed for subqueries in form "a IN (SELECT .. UNION SELECT ..):
when we optimize the select that reads the results of the union from a
temporary table, we must not mark the temp. table as constant because
the number of rows in it may vary from one subquery execution to another.
*/
bool no_const_tables;
JOIN *tmp_join; ///< copy of this JOIN to be used with temporary tables
ROLLUP rollup; ///< Used with rollup
bool select_distinct; ///< Set if SELECT DISTINCT
/**
If we have the GROUP BY statement in the query,
but the group_list was emptied by optimizer, this
flag is TRUE.
It happens when fields in the GROUP BY are from
constant table
*/
bool group_optimized_away;
/*
simple_xxxxx is set if ORDER/GROUP BY doesn't include any references
to other tables than the first non-constant table in the JOIN.
It's also set if ORDER/GROUP BY is empty.
Used for deciding for or against using a temporary table to compute
GROUP/ORDER BY.
*/
bool simple_order, simple_group;
/**
Is set only in case if we have a GROUP BY clause
and no ORDER BY after constant elimination of 'order'.
*/
bool no_order;
/** Is set if we have a GROUP BY and we have ORDER BY on a constant. */
bool skip_sort_order;
bool need_tmp, hidden_group_fields;
DYNAMIC_ARRAY keyuse;
Item::cond_result cond_value, having_value;
List<Item> all_fields; ///< to store all fields that used in query
///Above list changed to use temporary table
List<Item> tmp_all_fields1, tmp_all_fields2, tmp_all_fields3;
///Part, shared with list above, emulate following list
List<Item> tmp_fields_list1, tmp_fields_list2, tmp_fields_list3;
List<Item> &fields_list; ///< hold field list passed to mysql_select
List<Item> procedure_fields_list;
int error;
ORDER *order, *group_list, *proc_param; //hold parameters of mysql_select
COND *conds; // ---"---
Item *conds_history; // store WHERE for explain
TABLE_LIST *tables_list; ///<hold 'tables' parameter of mysql_select
List<TABLE_LIST> *join_list; ///< list of joined tables in reverse order
COND_EQUAL *cond_equal;
SQL_SELECT *select; ///<created in optimisation phase
JOIN_TAB *return_tab; ///<used only for outer joins
Item **ref_pointer_array; ///<used pointer reference for this select
// Copy of above to be used with different lists
Item **items0, **items1, **items2, **items3, **current_ref_pointer_array;
uint ref_pointer_array_size; ///< size of above in bytes
const char *zero_result_cause; ///< not 0 if exec must return zero result
bool union_part; ///< this subselect is part of union
bool optimized; ///< flag to avoid double optimization in EXPLAIN
/*
storage for caching buffers allocated during query execution.
These buffers allocations need to be cached as the thread memory pool is
cleared only at the end of the execution of the whole query and not caching
allocations that occur in repetition at execution time will result in
excessive memory usage.
Note: make_simple_join always creates an execution plan that accesses
a single table, thus it is sufficient to have a one-element array for
table_reexec.
*/
SORT_FIELD *sortorder; // make_unireg_sortorder()
TABLE *table_reexec[1]; // make_simple_join()
JOIN_TAB *join_tab_reexec; // make_simple_join()
/* end of allocation caching storage */
JOIN(THD *thd_arg, List<Item> &fields_arg, ulonglong select_options_arg,
select_result *result_arg)
:fields_list(fields_arg)
{
init(thd_arg, fields_arg, select_options_arg, result_arg);
}
void init(THD *thd_arg, List<Item> &fields_arg, ulonglong select_options_arg,
select_result *result_arg)
{
join_tab= join_tab_save= 0;
table= 0;
tables= 0;
const_tables= 0;
join_list= 0;
implicit_grouping= FALSE;
sort_and_group= 0;
first_record= 0;
do_send_rows= 1;
resume_nested_loop= FALSE;
send_records= 0;
found_records= 0;
fetch_limit= HA_POS_ERROR;
examined_rows= 0;
exec_tmp_table1= 0;
exec_tmp_table2= 0;
sortorder= 0;
table_reexec[0]= 0;
join_tab_reexec= 0;
thd= thd_arg;
sum_funcs= sum_funcs2= 0;
procedure= 0;
having= tmp_having= having_history= 0;
select_options= select_options_arg;
result= result_arg;
lock= thd_arg->lock;
select_lex= 0; //for safety
tmp_join= 0;
select_distinct= test(select_options & SELECT_DISTINCT);
no_order= 0;
simple_order= 0;
simple_group= 0;
skip_sort_order= 0;
need_tmp= 0;
hidden_group_fields= 0; /*safety*/
error= 0;
select= 0;
return_tab= 0;
ref_pointer_array= items0= items1= items2= items3= 0;
ref_pointer_array_size= 0;
zero_result_cause= 0;
optimized= 0;
cond_equal= 0;
group_optimized_away= 0;
all_fields= fields_arg;
if (&fields_list != &fields_arg) /* Avoid valgrind-warning */
fields_list= fields_arg;
bzero((char*) &keyuse,sizeof(keyuse));
tmp_table_param.init();
tmp_table_param.end_write_records= HA_POS_ERROR;
rollup.state= ROLLUP::STATE_NONE;
no_const_tables= FALSE;
}
int prepare(Item ***rref_pointer_array, TABLE_LIST *tables, uint wind_num,
COND *conds, uint og_num, ORDER *order, ORDER *group,
Item *having, ORDER *proc_param, SELECT_LEX *select,
SELECT_LEX_UNIT *unit);
int optimize();
int reinit();
void exec();
int destroy();
void restore_tmp();
bool alloc_func_list();
bool make_sum_func_list(List<Item> &all_fields, List<Item> &send_fields,
bool before_group_by, bool recompute= FALSE);
inline void set_items_ref_array(Item **ptr)
{
memcpy((char*) ref_pointer_array, (char*) ptr, ref_pointer_array_size);
current_ref_pointer_array= ptr;
}
inline void init_items_ref_array()
{
items0= ref_pointer_array + all_fields.elements;
memcpy(items0, ref_pointer_array, ref_pointer_array_size);
current_ref_pointer_array= items0;
}
bool rollup_init();
bool rollup_make_fields(List<Item> &all_fields, List<Item> &fields,
Item_sum ***func);
int rollup_send_data(uint idx);
int rollup_write_data(uint idx, TABLE *table);
void remove_subq_pushed_predicates(Item **where);
/**
Release memory and, if possible, the open tables held by this execution
plan (and nested plans). It's used to release some tables before
the end of execution in order to increase concurrency and reduce
memory consumption.
*/
void join_free();
/** Cleanup this JOIN, possibly for reuse */
void cleanup(bool full);
void clear();
bool save_join_tab();
bool init_save_join_tab();
bool send_row_on_empty_set()
{
return (do_send_rows && tmp_table_param.sum_func_count != 0 &&
!group_list && having_value != Item::COND_FALSE);
}
bool change_result(select_result *result);
bool is_top_level_join() const
{
return (unit == &thd->lex->unit && (unit->fake_select_lex == 0 ||
select_lex == unit->fake_select_lex));
}
private:
/**
TRUE if the query contains an aggregate function but has no GROUP
BY clause.
*/
bool implicit_grouping;
bool make_simple_join(JOIN *join, TABLE *tmp_table);
};
typedef struct st_select_check {
uint const_ref,reg_ref;
} SELECT_CHECK;
extern const char *join_type_str[];
void TEST_join(JOIN *join);
/* Extern functions in sql_select.cc */
bool store_val_in_field(Field *field, Item *val, enum_check_fields check_flag);
TABLE *create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
ORDER *group, bool distinct, bool save_sum_fields,
ulonglong select_options, ha_rows rows_limit,
char* alias);
void free_tmp_table(THD *thd, TABLE *entry);
void count_field_types(SELECT_LEX *select_lex, TMP_TABLE_PARAM *param,
List<Item> &fields, bool reset_with_sum_func);
bool setup_copy_fields(THD *thd, TMP_TABLE_PARAM *param,
Item **ref_pointer_array,
List<Item> &new_list1, List<Item> &new_list2,
uint elements, List<Item> &fields);
void copy_fields(TMP_TABLE_PARAM *param);
void copy_funcs(Item **func_ptr);
bool create_myisam_from_heap(THD *thd, TABLE *table, TMP_TABLE_PARAM *param,
int error, bool ignore_last_dupp_error);
uint find_shortest_key(TABLE *table, const key_map *usable_keys);
Field* create_tmp_field_from_field(THD *thd, Field* org_field,
const char *name, TABLE *table,
Item_field *item, uint convert_blob_length);
bool is_indexed_agg_distinct(JOIN *join, List<Item_field> *out_args);
/* functions from opt_sum.cc */
bool simple_pred(Item_func *func_item, Item **args, bool *inv_order);
int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds);
/* from sql_delete.cc, used by opt_range.cc */
extern "C" int refpos_order_cmp(void* arg, const void *a,const void *b);
/** class to copying an field/item to a key struct */
class store_key :public Sql_alloc
{
public:
bool null_key; /* TRUE <=> the value of the key has a null part */
enum store_key_result { STORE_KEY_OK, STORE_KEY_FATAL, STORE_KEY_CONV };
store_key(THD *thd, Field *field_arg, uchar *ptr, uchar *null, uint length)
:null_key(0), null_ptr(null), err(0)
{
if (field_arg->type() == MYSQL_TYPE_BLOB
|| field_arg->type() == MYSQL_TYPE_GEOMETRY)
{
/*
Key segments are always packed with a 2 byte length prefix.
See mi_rkey for details.
*/
to_field= new Field_varstring(ptr, length, 2, null, 1,
Field::NONE, field_arg->field_name,
field_arg->table->s, field_arg->charset());
to_field->init(field_arg->table);
}
else
to_field=field_arg->new_key_field(thd->mem_root, field_arg->table,
ptr, null, 1);
}
virtual ~store_key() {} /** Not actually needed */
virtual const char *name() const=0;
/**
@brief sets ignore truncation warnings mode and calls the real copy method
@details this function makes sure truncation warnings when preparing the
key buffers don't end up as errors (because of an enclosing INSERT/UPDATE).
*/
enum store_key_result copy()
{
enum store_key_result result;
THD *thd= to_field->table->in_use;
enum_check_fields saved_count_cuted_fields= thd->count_cuted_fields;
ulong sql_mode= thd->variables.sql_mode;
thd->variables.sql_mode&= ~(MODE_NO_ZERO_IN_DATE | MODE_NO_ZERO_DATE);
thd->count_cuted_fields= CHECK_FIELD_IGNORE;
result= copy_inner();
thd->count_cuted_fields= saved_count_cuted_fields;
thd->variables.sql_mode= sql_mode;
return result;
}
protected:
Field *to_field; // Store data here
uchar *null_ptr;
uchar err;
virtual enum store_key_result copy_inner()=0;
};
class store_key_field: public store_key
{
Copy_field copy_field;
const char *field_name;
public:
store_key_field(THD *thd, Field *to_field_arg, uchar *ptr,
uchar *null_ptr_arg,
uint length, Field *from_field, const char *name_arg)
:store_key(thd, to_field_arg,ptr,
null_ptr_arg ? null_ptr_arg : from_field->maybe_null() ? &err
: (uchar*) 0, length), field_name(name_arg)
{
if (to_field)
{
copy_field.set(to_field,from_field,0);
}
}
const char *name() const { return field_name; }
protected:
enum store_key_result copy_inner()
{
TABLE *table= copy_field.to_field->table;
my_bitmap_map *old_map= dbug_tmp_use_all_columns(table,
table->write_set);
copy_field.do_copy(&copy_field);
dbug_tmp_restore_column_map(table->write_set, old_map);
null_key= to_field->is_null();
return err != 0 ? STORE_KEY_FATAL : STORE_KEY_OK;
}
};
class store_key_item :public store_key
{
protected:
Item *item;
public:
store_key_item(THD *thd, Field *to_field_arg, uchar *ptr,
uchar *null_ptr_arg, uint length, Item *item_arg)
:store_key(thd, to_field_arg, ptr,
null_ptr_arg ? null_ptr_arg : item_arg->maybe_null ?
&err : (uchar*) 0, length), item(item_arg)
{}
const char *name() const { return "func"; }
protected:
enum store_key_result copy_inner()
{
TABLE *table= to_field->table;
my_bitmap_map *old_map= dbug_tmp_use_all_columns(table,
table->write_set);
int res= item->save_in_field(to_field, 1);
dbug_tmp_restore_column_map(table->write_set, old_map);
null_key= to_field->is_null() || item->null_value;
return (err != 0 || res > 2 ? STORE_KEY_FATAL : (store_key_result) res);
}
};
class store_key_const_item :public store_key_item
{
bool inited;
public:
store_key_const_item(THD *thd, Field *to_field_arg, uchar *ptr,
uchar *null_ptr_arg, uint length,
Item *item_arg)
:store_key_item(thd, to_field_arg,ptr,
null_ptr_arg ? null_ptr_arg : item_arg->maybe_null ?
&err : (uchar*) 0, length, item_arg), inited(0)
{
}
const char *name() const { return "const"; }
protected:
enum store_key_result copy_inner()
{
int res;
if (!inited)
{
inited=1;
if ((res= item->save_in_field(to_field, 1)))
{
if (!err)
err= res;
}
}
null_key= to_field->is_null() || item->null_value;
return (err > 2 ? STORE_KEY_FATAL : (store_key_result) err);
}
};
bool cp_buffer_from_ref(THD *thd, TABLE *table, TABLE_REF *ref);
bool error_if_full_join(JOIN *join);
int report_error(TABLE *table, int error);
int safe_index_read(JOIN_TAB *tab);
COND *remove_eq_conds(THD *thd, COND *cond, Item::cond_result *cond_value);
inline bool optimizer_flag(THD *thd, uint flag)
{
return (thd->variables.optimizer_switch & flag);
}
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