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mariadb/sql/sql_partition_admin.cc
Alexander Barkov fd247cc21f MDEV-31340 Remove MY_COLLATION_HANDLER::strcasecmp() 
This patch also fixes:
  MDEV-33050 Build-in schemas like oracle_schema are accent insensitive
  MDEV-33084 LASTVAL(t1) and LASTVAL(T1) do not work well with lower-case-table-names=0
  MDEV-33085 Tables T1 and t1 do not work well with ENGINE=CSV and lower-case-table-names=0
  MDEV-33086 SHOW OPEN TABLES IN DB1 -- is case insensitive with lower-case-table-names=0
  MDEV-33088 Cannot create triggers in the database `MYSQL`
  MDEV-33103 LOCK TABLE t1 AS t2 -- alias is not case sensitive with lower-case-table-names=0
  MDEV-33109 DROP DATABASE MYSQL -- does not drop SP with lower-case-table-names=0
  MDEV-33110 HANDLER commands are case insensitive with lower-case-table-names=0
  MDEV-33119 User is case insensitive in INFORMATION_SCHEMA.VIEWS
  MDEV-33120 System log table names are case insensitive with lower-cast-table-names=0

- Removing the virtual function strnncoll() from MY_COLLATION_HANDLER

- Adding a wrapper function CHARSET_INFO::streq(), to compare
  two strings for equality. For now it calls strnncoll() internally.
  In the future it will turn into a virtual function.

- Adding new accent sensitive case insensitive collations:
    - utf8mb4_general1400_as_ci
    - utf8mb3_general1400_as_ci
  They implement accent sensitive case insensitive comparison.
  The weight of a character is equal to the code point of its
  upper case variant. These collations use Unicode-14.0.0 casefolding data.

  The result of
     my_charset_utf8mb3_general1400_as_ci.strcoll()
  is very close to the former
     my_charset_utf8mb3_general_ci.strcasecmp()

  There is only a difference in a couple dozen rare characters, because:
    - the switch from "tolower" to "toupper" comparison, to make
      utf8mb3_general1400_as_ci closer to utf8mb3_general_ci
    - the switch from Unicode-3.0.0 to Unicode-14.0.0
  This difference should be tolarable. See the list of affected
  characters in the MDEV description.

  Note, utf8mb4_general1400_as_ci correctly handles non-BMP characters!
  Unlike utf8mb4_general_ci, it does not treat all BMP characters
  as equal.

- Adding classes representing names of the file based database objects:

    Lex_ident_db
    Lex_ident_table
    Lex_ident_trigger

  Their comparison collation depends on the underlying
  file system case sensitivity and on --lower-case-table-names
  and can be either my_charset_bin or my_charset_utf8mb3_general1400_as_ci.

- Adding classes representing names of other database objects,
  whose names have case insensitive comparison style,
  using my_charset_utf8mb3_general1400_as_ci:

  Lex_ident_column
  Lex_ident_sys_var
  Lex_ident_user_var
  Lex_ident_sp_var
  Lex_ident_ps
  Lex_ident_i_s_table
  Lex_ident_window
  Lex_ident_func
  Lex_ident_partition
  Lex_ident_with_element
  Lex_ident_rpl_filter
  Lex_ident_master_info
  Lex_ident_host
  Lex_ident_locale
  Lex_ident_plugin
  Lex_ident_engine
  Lex_ident_server
  Lex_ident_savepoint
  Lex_ident_charset
  engine_option_value::Name

- All the mentioned Lex_ident_xxx classes implement a method streq():

  if (ident1.streq(ident2))
     do_equal();

  This method works as a wrapper for CHARSET_INFO::streq().

- Changing a lot of "LEX_CSTRING name" to "Lex_ident_xxx name"
  in class members and in function/method parameters.

- Replacing all calls like
    system_charset_info->coll->strcasecmp(ident1, ident2)
  to
    ident1.streq(ident2)

- Taking advantage of the c++11 user defined literal operator
  for LEX_CSTRING (see m_strings.h) and Lex_ident_xxx (see lex_ident.h)
  data types. Use example:

  const Lex_ident_column primary_key_name= "PRIMARY"_Lex_ident_column;

  is now a shorter version of:

  const Lex_ident_column primary_key_name=
    Lex_ident_column({STRING_WITH_LEN("PRIMARY")});
2024-04-18 15:22:10 +04:00

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/* Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
Copyright (c) 2014, SkySQL Ab.
Copyright (c) 2016, 2018, MariaDB Corporation.
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 St, Fifth Floor, Boston, MA 02110-1335 USA */
#include "mariadb.h"
#include "sql_parse.h" // check_one_table_access
// check_merge_table_access
// check_one_table_access
#include "sql_table.h" // mysql_alter_table, etc.
#include "sql_cmd.h" // Sql_cmd
#include "sql_alter.h" // Sql_cmd_alter_table
#include "sql_partition.h" // struct partition_info, etc.
#include "debug_sync.h" // DEBUG_SYNC
#include "sql_truncate.h" // mysql_truncate_table,
// Sql_cmd_truncate_table
#include "sql_admin.h" // Analyze/Check/.._table_statement
#include "sql_partition_admin.h" // Alter_table_*_partition
#ifdef WITH_PARTITION_STORAGE_ENGINE
#include "ha_partition.h" // ha_partition
#endif
#include "sql_base.h" // open_and_lock_tables
#include "ddl_log.h"
#include "wsrep_mysqld.h"
#ifndef WITH_PARTITION_STORAGE_ENGINE
bool Sql_cmd_partition_unsupported::execute(THD *)
{
DBUG_ENTER("Sql_cmd_partition_unsupported::execute");
/* error, partitioning support not compiled in... */
my_error(ER_FEATURE_DISABLED, MYF(0), "partitioning",
"--with-plugin-partition");
DBUG_RETURN(TRUE);
}
#else
static bool return_with_logging(THD *thd)
{
if (thd->slave_thread &&
write_bin_log_with_if_exists(thd, true, false, true))
return(true);
my_ok(thd);
return(false);
}
bool Sql_cmd_alter_table_exchange_partition::execute(THD *thd)
{
/* Moved from mysql_execute_command */
LEX *lex= thd->lex;
/* first SELECT_LEX (have special meaning for many of non-SELECTcommands) */
SELECT_LEX *select_lex= lex->first_select_lex();
/* first table of first SELECT_LEX */
TABLE_LIST *first_table= (TABLE_LIST*) select_lex->table_list.first;
/*
Code in mysql_alter_table() may modify its HA_CREATE_INFO argument,
so we have to use a copy of this structure to make execution
prepared statement- safe. A shallow copy is enough as no memory
referenced from this structure will be modified.
@todo move these into constructor...
*/
IF_DBUG(HA_CREATE_INFO create_info(lex->create_info);,)
Alter_info alter_info(lex->alter_info, thd->mem_root);
privilege_t priv_needed(ALTER_ACL | DROP_ACL | INSERT_ACL | CREATE_ACL);
DBUG_ENTER("Sql_cmd_alter_table_exchange_partition::execute");
if (unlikely(thd->is_fatal_error))
{
/* out of memory creating a copy of alter_info */
DBUG_RETURN(TRUE);
}
/* Must be set in the parser */
DBUG_ASSERT(select_lex->db.str);
/* also check the table to be exchanged with the partition */
DBUG_ASSERT(alter_info.partition_flags & ALTER_PARTITION_EXCHANGE);
if (unlikely(check_access(thd, priv_needed, first_table->db.str,
&first_table->grant.privilege,
&first_table->grant.m_internal,
0, 0)) ||
unlikely(check_access(thd, priv_needed, first_table->next_local->db.str,
&first_table->next_local->grant.privilege,
&first_table->next_local->grant.m_internal,
0, 0)))
DBUG_RETURN(TRUE);
if (unlikely(check_grant(thd, priv_needed, first_table, FALSE, UINT_MAX,
FALSE)))
DBUG_RETURN(TRUE);
/* Not allowed with EXCHANGE PARTITION */
DBUG_ASSERT(!create_info.data_file_name && !create_info.index_file_name);
WSREP_TO_ISOLATION_BEGIN_WRTCHK(NULL, NULL, first_table);
DBUG_RETURN(exchange_partition(thd, first_table, &alter_info));
#ifdef WITH_WSREP
wsrep_error_label:
/* handle errors in TO_ISOLATION here */
DBUG_RETURN(true);
#endif /* WITH_WSREP */
}
/**
@brief Checks that the tables will be able to be used for EXCHANGE PARTITION.
@param table Non partitioned table.
@param part_table Partitioned table.
@retval FALSE if OK, otherwise error is reported and TRUE is returned.
*/
static bool check_exchange_partition(TABLE *table, TABLE *part_table)
{
DBUG_ENTER("check_exchange_partition");
/* Both tables must exist */
if (unlikely(!part_table || !table))
{
my_error(ER_CHECK_NO_SUCH_TABLE, MYF(0));
DBUG_RETURN(TRUE);
}
/* The first table must be partitioned, and the second must not */
if (unlikely(!part_table->part_info))
{
my_error(ER_PARTITION_MGMT_ON_NONPARTITIONED, MYF(0));
DBUG_RETURN(TRUE);
}
if (unlikely(table->part_info))
{
my_error(ER_PARTITION_EXCHANGE_PART_TABLE, MYF(0),
table->s->table_name.str);
DBUG_RETURN(TRUE);
}
if (unlikely(part_table->file->ht != partition_hton))
{
/*
Only allowed on partitioned tables throught the generic ha_partition
handler, i.e not yet for native partitioning.
*/
my_error(ER_PARTITION_MGMT_ON_NONPARTITIONED, MYF(0));
DBUG_RETURN(TRUE);
}
if (unlikely(table->file->ht != part_table->part_info->default_engine_type))
{
my_error(ER_MIX_HANDLER_ERROR, MYF(0));
DBUG_RETURN(TRUE);
}
/* Verify that table is not tmp table, partitioned tables cannot be tmp. */
if (unlikely(table->s->tmp_table != NO_TMP_TABLE))
{
my_error(ER_PARTITION_EXCHANGE_TEMP_TABLE, MYF(0),
table->s->table_name.str);
DBUG_RETURN(TRUE);
}
/* The table cannot have foreign keys constraints or be referenced */
if (unlikely(!table->file->can_switch_engines()))
{
my_error(ER_PARTITION_EXCHANGE_FOREIGN_KEY, MYF(0),
table->s->table_name.str);
DBUG_RETURN(TRUE);
}
DBUG_RETURN(FALSE);
}
/**
@brief Compare table structure/options between a non partitioned table
and a specific partition of a partitioned table.
@param thd Thread object.
@param table Non partitioned table.
@param part_table Partitioned table.
@param part_elem Partition element to use for partition specific compare.
*/
bool compare_table_with_partition(THD *thd, TABLE *table, TABLE *part_table,
partition_element *part_elem, uint part_id)
{
HA_CREATE_INFO table_create_info;
Table_specification_st part_create_info;
Alter_info part_alter_info;
Alter_table_ctx part_alter_ctx; // Not used
DBUG_ENTER("compare_table_with_partition");
bool metadata_equal= false;
part_create_info.init();
table_create_info.init();
update_create_info_from_table(&table_create_info, table);
/* get the current auto_increment value */
table->file->update_create_info(&table_create_info);
/* mark all columns used, since they are used when preparing the new table */
part_table->use_all_columns();
table->use_all_columns();
if (unlikely(mysql_prepare_alter_table(thd, part_table, &part_create_info,
&part_alter_info, &part_alter_ctx)))
{
my_error(ER_TABLES_DIFFERENT_METADATA, MYF(0));
DBUG_RETURN(TRUE);
}
/* db_type is not set in prepare_alter_table */
part_create_info.db_type= part_table->part_info->default_engine_type;
((ha_partition*)(part_table->file))->update_part_create_info(&part_create_info, part_id);
/*
Since we exchange the partition with the table, allow exchanging
auto_increment value as well.
*/
part_create_info.auto_increment_value=
table_create_info.auto_increment_value;
/* Check compatible row_types and set create_info accordingly. */
{
enum row_type part_row_type= part_table->file->get_row_type();
enum row_type table_row_type= table->file->get_row_type();
if (part_row_type != table_row_type)
{
my_error(ER_PARTITION_EXCHANGE_DIFFERENT_OPTION, MYF(0),
"ROW_FORMAT");
DBUG_RETURN(true);
}
part_create_info.row_type= table->s->row_type;
}
/*
NOTE: ha_blackhole does not support check_if_compatible_data,
so this always fail for blackhole tables.
ha_myisam compares pointers to verify that DATA/INDEX DIRECTORY is
the same, so any table using data/index_file_name will fail.
*/
if (mysql_compare_tables(table, &part_alter_info, &part_create_info,
&metadata_equal))
{
my_error(ER_TABLES_DIFFERENT_METADATA, MYF(0));
DBUG_RETURN(TRUE);
}
DEBUG_SYNC(thd, "swap_partition_after_compare_tables");
if (!metadata_equal)
{
my_error(ER_TABLES_DIFFERENT_METADATA, MYF(0));
DBUG_RETURN(TRUE);
}
if (table->s->db_create_options != part_table->s->db_create_options)
{
my_error(ER_TABLES_DIFFERENT_METADATA, MYF(0));
DBUG_RETURN(TRUE);
}
DBUG_ASSERT(table->s->db_options_in_use ==
part_table->s->db_options_in_use);
if (table_create_info.avg_row_length != part_create_info.avg_row_length)
{
my_error(ER_PARTITION_EXCHANGE_DIFFERENT_OPTION, MYF(0),
"AVG_ROW_LENGTH");
DBUG_RETURN(TRUE);
}
if (table_create_info.table_options != part_create_info.table_options)
{
my_error(ER_PARTITION_EXCHANGE_DIFFERENT_OPTION, MYF(0),
"TABLE OPTION");
DBUG_RETURN(TRUE);
}
if (table->s->table_charset != part_table->s->table_charset)
{
my_error(ER_PARTITION_EXCHANGE_DIFFERENT_OPTION, MYF(0),
"CHARACTER SET");
DBUG_RETURN(TRUE);
}
/*
NOTE: We do not support update of frm-file, i.e. change
max/min_rows, data/index_file_name etc.
The workaround is to use REORGANIZE PARTITION to rewrite
the frm file and then use EXCHANGE PARTITION when they are the same.
*/
if (part_elem && compare_partition_options(&table_create_info, part_elem))
DBUG_RETURN(TRUE);
DBUG_RETURN(FALSE);
}
/**
@brief Exchange partition/table with ddl log.
@details How to handle a crash in the middle of the rename (break on error):
1) register in ddl_log that we are going to exchange swap_table with part.
2) do the first rename (swap_table -> tmp-name) and sync the ddl_log.
3) do the second rename (part -> swap_table) and sync the ddl_log.
4) do the last rename (tmp-name -> part).
5) mark the entry done.
Recover by:
5) is done, All completed. Nothing to recover.
4) is done see 3). (No mark or sync in the ddl_log...)
3) is done -> try rename part -> tmp-name (ignore failure) goto 2).
2) is done -> try rename swap_table -> part (ignore failure) goto 1).
1) is done -> try rename tmp-name -> swap_table (ignore failure).
before 1) Nothing to recover...
@param thd Thread handle
@param name name of table/partition 1 (to be exchanged with 2)
@param from_name name of table/partition 2 (to be exchanged with 1)
@param tmp_name temporary name to use while exchaning
@param ht handlerton of the table/partitions
@return Operation status
@retval TRUE Error
@retval FALSE Success
@note ha_heap always succeeds in rename (since it is created upon usage).
This is OK when to recover from a crash since all heap are empty and the
recover is done early in the startup of the server (right before
read_init_file which can populate the tables).
And if no crash we can trust the syncs in the ddl_log.
What about if the rename is put into a background thread? That will cause
corruption and is avoided by the exlusive metadata lock.
*/
static bool exchange_name_with_ddl_log(THD *thd,
const char *name,
const char *from_name,
const char *tmp_name,
handlerton *ht)
{
DDL_LOG_ENTRY exchange_entry;
DDL_LOG_MEMORY_ENTRY *log_entry= NULL;
DDL_LOG_MEMORY_ENTRY *exec_log_entry= NULL;
bool error= TRUE;
bool error_set= FALSE;
handler *file= NULL;
DBUG_ENTER("exchange_name_with_ddl_log");
if (unlikely(!(file= get_new_handler(NULL, thd->mem_root, ht))))
DBUG_RETURN(TRUE);
/* prepare the action entry */
bzero(&exchange_entry, sizeof(exchange_entry));
exchange_entry.entry_type= DDL_LOG_ENTRY_CODE;
exchange_entry.action_type= DDL_LOG_EXCHANGE_ACTION;
lex_string_set(&exchange_entry.name, name);
lex_string_set(&exchange_entry.from_name, from_name);
lex_string_set(&exchange_entry.tmp_name, tmp_name);
lex_string_set(&exchange_entry.handler_name,
ha_resolve_storage_engine_name(ht));
exchange_entry.phase= EXCH_PHASE_NAME_TO_TEMP;
mysql_mutex_lock(&LOCK_gdl);
/*
write to the ddl log what to do by:
1) write the action entry (i.e. which names to be exchanged)
2) write the execution entry with a link to the action entry
*/
DBUG_EXECUTE_IF("exchange_partition_fail_1", goto err_no_action_written;);
DBUG_EXECUTE_IF("exchange_partition_abort_1", DBUG_SUICIDE(););
if (unlikely(ddl_log_write_entry(&exchange_entry, &log_entry)))
goto err_no_action_written;
DBUG_EXECUTE_IF("exchange_partition_fail_2", goto err_no_execute_written;);
DBUG_EXECUTE_IF("exchange_partition_abort_2", DBUG_SUICIDE(););
if (unlikely(ddl_log_write_execute_entry(log_entry->entry_pos,
&exec_log_entry)))
goto err_no_execute_written;
/* ddl_log is written and synced */
mysql_mutex_unlock(&LOCK_gdl);
/*
Execute the name exchange.
Do one rename, increase the phase, update the action entry and sync.
In case of errors in the ddl_log we must fail and let the ddl_log try
to revert the changes, since otherwise it could revert the command after
we sent OK to the client.
*/
/* call rename table from table to tmp-name */
DBUG_EXECUTE_IF("exchange_partition_fail_3",
my_error(ER_ERROR_ON_RENAME, MYF(0), name, tmp_name, 0);
error_set= TRUE;
goto err_rename;);
DBUG_EXECUTE_IF("exchange_partition_abort_3", DBUG_SUICIDE(););
if (unlikely(file->ha_rename_table(name, tmp_name)))
{
my_error(ER_ERROR_ON_RENAME, MYF(0), name, tmp_name, my_errno);
error_set= TRUE;
goto err_rename;
}
DBUG_EXECUTE_IF("exchange_partition_fail_4", goto err_rename;);
DBUG_EXECUTE_IF("exchange_partition_abort_4", DBUG_SUICIDE(););
if (unlikely(ddl_log_increment_phase(log_entry->entry_pos)))
goto err_rename;
/* call rename table from partition to table */
DBUG_EXECUTE_IF("exchange_partition_fail_5",
my_error(ER_ERROR_ON_RENAME, MYF(0), from_name, name, 0);
error_set= TRUE;
goto err_rename;);
DBUG_EXECUTE_IF("exchange_partition_abort_5", DBUG_SUICIDE(););
if (unlikely(file->ha_rename_table(from_name, name)))
{
my_error(ER_ERROR_ON_RENAME, MYF(0), from_name, name, my_errno);
error_set= TRUE;
goto err_rename;
}
DBUG_EXECUTE_IF("exchange_partition_fail_6", goto err_rename;);
DBUG_EXECUTE_IF("exchange_partition_abort_6", DBUG_SUICIDE(););
if (unlikely(ddl_log_increment_phase(log_entry->entry_pos)))
goto err_rename;
/* call rename table from tmp-nam to partition */
DBUG_EXECUTE_IF("exchange_partition_fail_7",
my_error(ER_ERROR_ON_RENAME, MYF(0), tmp_name, from_name, 0);
error_set= TRUE;
goto err_rename;);
DBUG_EXECUTE_IF("exchange_partition_abort_7", DBUG_SUICIDE(););
if (unlikely(file->ha_rename_table(tmp_name, from_name)))
{
my_error(ER_ERROR_ON_RENAME, MYF(0), tmp_name, from_name, my_errno);
error_set= TRUE;
goto err_rename;
}
DBUG_EXECUTE_IF("exchange_partition_fail_8", goto err_rename;);
DBUG_EXECUTE_IF("exchange_partition_abort_8", DBUG_SUICIDE(););
if (unlikely(ddl_log_increment_phase(log_entry->entry_pos)))
goto err_rename;
/* The exchange is complete and ddl_log is deactivated */
DBUG_EXECUTE_IF("exchange_partition_fail_9", goto err_rename;);
DBUG_EXECUTE_IF("exchange_partition_abort_9", DBUG_SUICIDE(););
/* all OK */
error= FALSE;
delete file;
DBUG_RETURN(error);
err_rename:
/*
Nothing to do if any of these commands fails :( the commands itselfs
will log to the error log about the failures...
*/
/* execute the ddl log entry to revert the renames */
(void) ddl_log_execute_entry(current_thd, log_entry->entry_pos);
mysql_mutex_lock(&LOCK_gdl);
/* mark the execute log entry done */
(void) ddl_log_disable_execute_entry(&exec_log_entry);
/* release the execute log entry */
(void) ddl_log_release_memory_entry(exec_log_entry);
err_no_execute_written:
/* release the action log entry */
(void) ddl_log_release_memory_entry(log_entry);
err_no_action_written:
mysql_mutex_unlock(&LOCK_gdl);
delete file;
if (!error_set)
my_error(ER_DDL_LOG_ERROR, MYF(0));
DBUG_RETURN(error);
}
/**
@brief Swap places between a partition and a table.
@details Verify that the tables are compatible (same engine, definition etc),
verify that all rows in the table will fit in the partition,
if all OK, rename table to tmp name, rename partition to table
and finally rename tmp name to partition.
1) Take upgradable mdl, open tables and then lock them (inited in parse)
2) Verify that metadata matches
3) verify data
4) Upgrade to exclusive mdl for both tables
5) Rename table <-> partition
6) Rely on close_thread_tables to release mdl and table locks
@param thd Thread handle
@param table_list Table where the partition exists as first table,
Table to swap with the partition as second table
@param alter_info Contains partition name to swap
@note This is a DDL operation so triggers will not be used.
*/
bool Sql_cmd_alter_table_exchange_partition::
exchange_partition(THD *thd, TABLE_LIST *table_list, Alter_info *alter_info)
{
TABLE *part_table, *swap_table;
TABLE_LIST *swap_table_list;
handlerton *table_hton;
partition_element *part_elem;
char temp_name[FN_REFLEN+1];
char part_file_name[2*FN_REFLEN+1];
char swap_file_name[FN_REFLEN+1];
char temp_file_name[FN_REFLEN+1];
char part_table_name[NAME_LEN + 1];
char part_db[NAME_LEN + 1];
char swap_table_name[NAME_LEN + 1];
char swap_db[NAME_LEN + 1];
uchar part_tabledef_version[MY_UUID_SIZE];
uchar swap_tabledef_version[MY_UUID_SIZE];
backup_log_info ddl_log;
bzero(&ddl_log, sizeof(ddl_log));
uint swap_part_id;
uint part_file_name_len;
Alter_table_prelocking_strategy alter_prelocking_strategy;
MDL_ticket *swap_table_mdl_ticket= NULL;
MDL_ticket *part_table_mdl_ticket= NULL;
uint table_counter;
bool error= TRUE, force_if_exists= 0;
ulonglong save_option_bits= thd->variables.option_bits;
DBUG_ENTER("mysql_exchange_partition");
DBUG_ASSERT(alter_info->partition_flags & ALTER_PARTITION_EXCHANGE);
/* Don't allow to exchange with log table */
swap_table_list= table_list->next_local;
if (check_if_log_table(swap_table_list, FALSE, "ALTER PARTITION"))
DBUG_RETURN(TRUE);
/*
Currently no MDL lock that allows both read and write and is upgradeable
to exclusive, so leave the lock type to TL_WRITE_ALLOW_READ also on the
partitioned table.
TODO: add MDL lock that allows both read and write and is upgradable to
exclusive lock. This would allow to continue using the partitioned table
also with update/insert/delete while the verification of the swap table
is running.
*/
/*
NOTE: It is not possible to exchange a crashed partition/table since
we need some info from the engine, which we can only access after open,
to be able to verify the structure/metadata.
*/
table_list->mdl_request.set_type(MDL_SHARED_NO_WRITE);
if (unlikely(open_tables(thd, &table_list, &table_counter, 0,
&alter_prelocking_strategy)))
{
if (thd->lex->if_exists() &&
thd->get_stmt_da()->sql_errno() == ER_NO_SUCH_TABLE)
{
/*
ALTER TABLE IF EXISTS was used on not existing table
We have to log the query on a slave as the table may be a shared one
from the master and we need to ensure that the next slave can see
the statement as this slave may not have the table shared
*/
thd->clear_error();
if (thd->slave_thread &&
write_bin_log(thd, true, thd->query(), thd->query_length()))
DBUG_RETURN(true);
my_ok(thd);
DBUG_RETURN(false);
}
DBUG_RETURN(true);
}
part_table= table_list->table;
swap_table= swap_table_list->table;
/* Don't allow to exchange with a VIEW */
if (unlikely(swap_table_list->view))
{
my_error(ER_WRONG_OBJECT, MYF(0), table_list->db.str,
swap_table_list->table_name.str, "BASE TABLE");
DBUG_RETURN(TRUE);
}
if (unlikely(check_exchange_partition(swap_table, part_table)))
DBUG_RETURN(TRUE);
if (part_table->file->check_if_updates_are_ignored("ALTER"))
DBUG_RETURN(return_with_logging(thd));
/* Add IF EXISTS to binlog if shared table */
if (part_table->file->partition_ht()->flags &
HTON_TABLE_MAY_NOT_EXIST_ON_SLAVE)
force_if_exists= 1;
ddl_log.org_table.str= part_table_name;
DBUG_ASSERT(part_table->s->table_name.length <= NAME_LEN);
ddl_log.org_table.length= part_table->s->table_name.length;
strmake(part_table_name, part_table->s->table_name.str, NAME_LEN);
ddl_log.org_database.str= part_db;
DBUG_ASSERT(part_table->s->db.length <= NAME_LEN);
ddl_log.org_database.length= part_table->s->db.length;
strmake(part_db, part_table->s->db.str, NAME_LEN);
ddl_log.new_table.str= swap_table_name;
DBUG_ASSERT(swap_table->s->table_name.length <= NAME_LEN);
ddl_log.new_table.length= swap_table->s->table_name.length;
strmake(swap_table_name, swap_table->s->table_name.str, NAME_LEN);
ddl_log.new_database.str= swap_db;
DBUG_ASSERT(swap_table->s->db.length <= NAME_LEN);
ddl_log.new_database.length= swap_table->s->db.length;
strmake(swap_db, swap_table->s->db.str, NAME_LEN);
memcpy(part_tabledef_version, part_table->s->tabledef_version.str,
MY_UUID_SIZE);
ddl_log.org_table_id.str= part_tabledef_version;
ddl_log.org_table_id.length= MY_UUID_SIZE;
memcpy(swap_tabledef_version, swap_table->s->tabledef_version.str,
MY_UUID_SIZE);
ddl_log.new_table_id.str= swap_tabledef_version;
ddl_log.new_table_id.length= MY_UUID_SIZE;
/* set lock pruning on first table */
const Lex_cstring_strlen partition_name= alter_info->partition_names.head();
if (unlikely(table_list->table->part_info->
set_named_partition_bitmap(partition_name.str,
partition_name.length)))
DBUG_RETURN(true);
if (unlikely(lock_tables(thd, table_list, table_counter, 0)))
DBUG_RETURN(true);
table_hton= swap_table->file->ht;
THD_STAGE_INFO(thd, stage_verifying_table);
/* Will append the partition name later in part_info->get_part_elem() */
part_file_name_len= build_table_filename(part_file_name,
sizeof(part_file_name),
table_list->db.str,
table_list->table_name.str,
"", 0);
build_table_filename(swap_file_name,
sizeof(swap_file_name),
swap_table_list->db.str,
swap_table_list->table_name.str,
"", 0);
/* create a unique temp name */
my_snprintf(temp_name, sizeof(temp_name), "%s-exchange-%lx-%llx",
tmp_file_prefix, current_pid, thd->thread_id);
if (lower_case_table_names)
{
// Ok to use latin1 as the file name is in the form '#sql-exchange-abc-def'
my_casedn_str_latin1(temp_name);
}
build_table_filename(temp_file_name, sizeof(temp_file_name),
table_list->next_local->db.str,
temp_name, "", FN_IS_TMP);
if (unlikely(!(part_elem=
part_table->part_info->get_part_elem(partition_name,
part_file_name +
part_file_name_len,
sizeof(part_file_name) -
part_file_name_len,
&swap_part_id))))
{
DBUG_RETURN(TRUE);
}
if (unlikely(swap_part_id == NOT_A_PARTITION_ID))
{
DBUG_ASSERT(part_table->part_info->is_sub_partitioned());
my_error(ER_PARTITION_INSTEAD_OF_SUBPARTITION, MYF(0));
DBUG_RETURN(TRUE);
}
if (unlikely(compare_table_with_partition(thd, swap_table, part_table,
part_elem,
swap_part_id)))
DBUG_RETURN(TRUE);
/* Table and partition has same structure/options, OK to exchange */
thd_proc_info(thd, "Verifying data with partition");
if (unlikely(verify_data_with_partition(swap_table, part_table,
swap_part_id)))
DBUG_RETURN(TRUE);
/*
Get exclusive mdl lock on both tables, alway the non partitioned table
first. Remember the tickets for downgrading locks later.
*/
swap_table_mdl_ticket= swap_table->mdl_ticket;
part_table_mdl_ticket= part_table->mdl_ticket;
/*
No need to set used_partitions to only propagate
HA_EXTRA_PREPARE_FOR_RENAME to one part since no built in engine uses
that flag. And the action would probably be to force close all other
instances which is what we are doing any way.
*/
if (wait_while_table_is_used(thd, swap_table, HA_EXTRA_PREPARE_FOR_RENAME) ||
wait_while_table_is_used(thd, part_table, HA_EXTRA_PREPARE_FOR_RENAME))
goto err;
DEBUG_SYNC(thd, "swap_partition_after_wait");
close_all_tables_for_name(thd, swap_table->s, HA_EXTRA_NOT_USED, NULL);
close_all_tables_for_name(thd, part_table->s, HA_EXTRA_NOT_USED, NULL);
DEBUG_SYNC(thd, "swap_partition_before_rename");
if (unlikely(exchange_name_with_ddl_log(thd, swap_file_name, part_file_name,
temp_file_name, table_hton)))
goto err;
/*
Reopen tables under LOCK TABLES. Ignore the return value for now. It's
better to keep master/slave in consistent state. Alternative would be to
try to revert the exchange operation and issue error.
*/
(void) thd->locked_tables_list.reopen_tables(thd, false);
if (force_if_exists)
thd->variables.option_bits|= OPTION_IF_EXISTS;
if (unlikely((error= write_bin_log(thd, TRUE, thd->query(),
thd->query_length()))))
{
/*
The error is reported in write_bin_log().
We try to revert to make it easier to keep the master/slave in sync.
*/
(void) exchange_name_with_ddl_log(thd, part_file_name, swap_file_name,
temp_file_name, table_hton);
}
else
{
ddl_log.query= { C_STRING_WITH_LEN("EXCHANGE_PARTITION") };
ddl_log.org_partitioned= true;
ddl_log.new_partitioned= false;
ddl_log.org_storage_engine_name= *hton_name(table_hton);
ddl_log.new_storage_engine_name= *hton_name(table_hton);
backup_log_ddl(&ddl_log);
}
thd->variables.option_bits= save_option_bits;
err:
if (thd->locked_tables_mode)
{
if (swap_table_mdl_ticket)
swap_table_mdl_ticket->downgrade_lock(MDL_SHARED_NO_READ_WRITE);
if (part_table_mdl_ticket)
part_table_mdl_ticket->downgrade_lock(MDL_SHARED_NO_READ_WRITE);
}
if (unlikely(!error))
my_ok(thd);
// For query cache
table_list->table= NULL;
table_list->next_local->table= NULL;
query_cache_invalidate3(thd, table_list, FALSE);
DBUG_RETURN(error);
}
bool Sql_cmd_alter_table_analyze_partition::execute(THD *thd)
{
bool res;
DBUG_ENTER("Sql_cmd_alter_table_analyze_partition::execute");
/*
Flag that it is an ALTER command which administrates partitions, used
by ha_partition
*/
thd->lex->alter_info.partition_flags|= ALTER_PARTITION_ADMIN;
res= Sql_cmd_analyze_table::execute(thd);
DBUG_RETURN(res);
}
bool Sql_cmd_alter_table_check_partition::execute(THD *thd)
{
bool res;
DBUG_ENTER("Sql_cmd_alter_table_check_partition::execute");
/*
Flag that it is an ALTER command which administrates partitions, used
by ha_partition
*/
thd->lex->alter_info.partition_flags|= ALTER_PARTITION_ADMIN;
res= Sql_cmd_check_table::execute(thd);
DBUG_RETURN(res);
}
bool Sql_cmd_alter_table_optimize_partition::execute(THD *thd)
{
bool res;
DBUG_ENTER("Alter_table_optimize_partition_statement::execute");
/*
Flag that it is an ALTER command which administrates partitions, used
by ha_partition
*/
thd->lex->alter_info.partition_flags|= ALTER_PARTITION_ADMIN;
res= Sql_cmd_optimize_table::execute(thd);
DBUG_RETURN(res);
}
bool Sql_cmd_alter_table_repair_partition::execute(THD *thd)
{
bool res;
DBUG_ENTER("Sql_cmd_alter_table_repair_partition::execute");
/*
Flag that it is an ALTER command which administrates partitions, used
by ha_partition
*/
thd->lex->alter_info.partition_flags|= ALTER_PARTITION_ADMIN;
res= Sql_cmd_repair_table::execute(thd);
DBUG_RETURN(res);
}
bool Sql_cmd_alter_table_truncate_partition::execute(THD *thd)
{
int error;
ha_partition *partition;
ulong timeout= thd->variables.lock_wait_timeout;
TABLE_LIST *first_table= thd->lex->first_select_lex()->table_list.first;
Alter_info *alter_info= &thd->lex->alter_info;
uint table_counter, i;
List<String> partition_names_list;
bool binlog_stmt, force_if_exists= 0;
DBUG_ENTER("Sql_cmd_alter_table_truncate_partition::execute");
/*
Flag that it is an ALTER command which administrates partitions, used
by ha_partition.
*/
thd->lex->alter_info.partition_flags|= (ALTER_PARTITION_ADMIN |
ALTER_PARTITION_TRUNCATE);
/* Fix the lock types (not the same as ordinary ALTER TABLE). */
first_table->lock_type= TL_WRITE;
first_table->mdl_request.set_type(MDL_EXCLUSIVE);
/*
Check table permissions and open it with a exclusive lock.
Ensure it is a partitioned table and finally, upcast the
handler and invoke the partition truncate method. Lastly,
write the statement to the binary log if necessary.
*/
if (check_one_table_access(thd, DROP_ACL, first_table))
DBUG_RETURN(TRUE);
#ifdef WITH_WSREP
if (WSREP(thd) &&
(!thd->is_current_stmt_binlog_format_row() ||
!thd->find_temporary_table(first_table)) &&
wsrep_to_isolation_begin(
thd, first_table->db.str, first_table->table_name.str, NULL)
)
{
WSREP_WARN("ALTER TABLE TRUNCATE PARTITION isolation failure");
DBUG_RETURN(TRUE);
}
#endif /* WITH_WSREP */
if (open_tables(thd, &first_table, &table_counter, 0))
{
if (thd->lex->if_exists() &&
thd->get_stmt_da()->sql_errno() == ER_NO_SUCH_TABLE)
{
/*
ALTER TABLE IF EXISTS was used on not existing table
We have to log the query on a slave as the table may be a shared one
from the master and we need to ensure that the next slave can see
the statement as this slave may not have the table shared
*/
thd->clear_error();
DBUG_RETURN(return_with_logging(thd));
}
DBUG_RETURN(TRUE);
}
if (!first_table->table || first_table->view)
{
my_error(ER_PARTITION_MGMT_ON_NONPARTITIONED, MYF(0));
DBUG_RETURN(TRUE);
}
if (first_table->table->file->check_if_updates_are_ignored("ALTER"))
DBUG_RETURN(return_with_logging(thd));
if (first_table->table->s->db_type() != partition_hton)
{
my_error(ER_PARTITION_MGMT_ON_NONPARTITIONED, MYF(0));
DBUG_RETURN(TRUE);
}
if (first_table->table->file->partition_ht()->flags &
HTON_TABLE_MAY_NOT_EXIST_ON_SLAVE)
force_if_exists= 1;
/*
Prune all, but named partitions,
to avoid excessive calls to external_lock().
*/
List_iterator<const char> partition_names_it(alter_info->partition_names);
uint num_names= alter_info->partition_names.elements;
for (i= 0; i < num_names; i++)
{
const char *partition_name= partition_names_it++;
String *str_partition_name= new (thd->mem_root)
String(partition_name, strlen(partition_name), system_charset_info);
if (!str_partition_name)
DBUG_RETURN(true);
partition_names_list.push_back(str_partition_name, thd->mem_root);
}
if (first_table->table->
part_info->set_partition_bitmaps(&partition_names_list))
DBUG_RETURN(true);
if (lock_tables(thd, first_table, table_counter, 0))
DBUG_RETURN(true);
/*
Under locked table modes this might still not be an exclusive
lock. Hence, upgrade the lock since the handler truncate method
mandates an exclusive metadata lock.
*/
MDL_ticket *ticket= first_table->table->mdl_ticket;
if (thd->mdl_context.upgrade_shared_lock(ticket, MDL_EXCLUSIVE, timeout))
DBUG_RETURN(TRUE);
first_table->table->s->tdc->flush(thd, true);
partition= (ha_partition*) first_table->table->file;
/* Invoke the handler method responsible for truncating the partition. */
if (unlikely(error= partition->truncate_partition(alter_info,
&binlog_stmt)))
partition->print_error(error, MYF(0));
/*
All effects of a truncate operation are committed even if the
operation fails. Thus, the query must be written to the binary
log. The exception is a unimplemented truncate method or failure
before any call to handler::truncate() is done.
Also, it is logged in statement format, regardless of the binlog format.
Since we've changed data within the table, we also have to invalidate
the query cache for it.
*/
if (likely(error != HA_ERR_WRONG_COMMAND))
{
ulonglong save_option_bits= thd->variables.option_bits;
if (force_if_exists)
thd->variables.option_bits|= OPTION_IF_EXISTS;
query_cache_invalidate3(thd, first_table, FALSE);
if (binlog_stmt)
error|= write_bin_log(thd, !error, thd->query(), thd->query_length());
thd->variables.option_bits= save_option_bits;
}
/*
A locked table ticket was upgraded to a exclusive lock. After the
the query has been written to the binary log, downgrade the lock
to a shared one.
*/
if (thd->locked_tables_mode)
ticket->downgrade_lock(MDL_SHARED_NO_READ_WRITE);
if (likely(!error))
my_ok(thd);
// Invalidate query cache
DBUG_ASSERT(!first_table->next_local);
query_cache_invalidate3(thd, first_table, FALSE);
DBUG_RETURN(error);
}
/**
Move a table specified in the CONVERT TABLE <table_name> TO PARTITION ...
to the new partition.
@param lpt A structure containing parameters regarding to the statement
ALTER TABLE ... TO PARTITION ...
@param part_file_name a file name of the partition being added
@return false on success, true on error
*/
bool alter_partition_convert_in(ALTER_PARTITION_PARAM_TYPE *lpt)
{
char part_file_name[2*FN_REFLEN+1];
THD *thd= lpt->thd;
const char *path= lpt->table_list->table->s->path.str;
TABLE_LIST *table_from= lpt->table_list->next_local;
const Lex_ident_partition &partition_name=
thd->lex->part_info->curr_part_elem->partition_name;
if (create_partition_name(part_file_name, sizeof(part_file_name), path,
partition_name, NORMAL_PART_NAME, false))
return true;
char from_file_name[FN_REFLEN+1];
build_table_filename(from_file_name, sizeof(from_file_name),
table_from->db.str, table_from->table_name.str, "", 0);
handler *file= get_new_handler(nullptr, thd->mem_root,
table_from->table->file->ht);
if (unlikely(!file))
return true;
close_all_tables_for_name(thd, table_from->table->s,
HA_EXTRA_PREPARE_FOR_RENAME, nullptr);
bool res= file->ha_rename_table(from_file_name, part_file_name);
if (res)
my_error(ER_ERROR_ON_RENAME, MYF(0), from_file_name,
part_file_name, my_errno);
delete file;
return res;
}
#endif /* WITH_PARTITION_STORAGE_ENGINE */
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