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Fixed proper merge of partitioning with

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WL #2301 ALTER TABLE optimisations
This commit is contained in:
pappa@c-8b0ae253.1238-1-64736c10.cust.bredbandsbolaget.se
2005-07-27 16:56:28 -04:00
parent 4954b60037
commit e1b44e91fb
1 changed files with 16 additions and 0 deletions
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16
sql/sql_table.cc
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@ -3287,6 +3287,9 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
uint db_create_options, used_fields;
enum db_type old_db_type,new_db_type;
uint need_copy_table= 0;
#ifdef HAVE_PARTITION_DB
bool partition_changed= FALSE;
#endif
DBUG_ENTER("mysql_alter_table");
thd->proc_info="init";
@ -3372,6 +3375,8 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
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.
@ -3390,27 +3395,34 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
the old partitioning info and create a new table using the specified
engine. This is the reason for the extra check if old and new engine
is equal.
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.
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.
*/
if (table->s->part_info)
{
if (!thd->lex->part_info &&
create_info->db_type == old_db_type)
thd->lex->part_info= table->s->part_info;
}
if (thd->lex->part_info)
{
/*
Need to cater for engine types that can handle partition without
using the partition handler.
*/
if (thd->lex->part_info != table->s->part_info)
partition_changed= TRUE;
thd->lex->part_info->default_engine_type= create_info->db_type;
create_info->db_type= DB_TYPE_PARTITION_DB;
}
@ -3780,7 +3792,11 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
set_table_default_charset(thd, create_info, db);
#ifdef HAVE_PARTITION_DB
if (thd->variables.old_alter_table || partition_changed)
#else
if (thd->variables.old_alter_table)
#endif
need_copy_table= 1;
else
need_copy_table= compare_tables(table, &create_list, &key_list,