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Fixed bug #21727.

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This is a performance issue for queries with subqueries evaluation
of which requires filesort.
Allocation of memory for the sort buffer at each evaluation of a
subquery may take a significant amount of time if the buffer is rather big.
With the fix we allocate the buffer at the first evaluation of the
subquery and reuse it at each subsequent evaluation.
This commit is contained in:
igor@rurik.mysql.com
2006-10-31 17:31:56 -08:00
parent 17eb0b353e
commit 2a7acba7e1
12 changed files with 124 additions and 16 deletions
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3
sql/sql_table.cc
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@@ -2266,7 +2266,6 @@ static bool mysql_admin_table(THD* thd, TABLE_LIST* tables,
goto send_result;
}
table->table->pos_in_table_list= table;
if ((table->table->db_stat & HA_READ_ONLY) && open_for_modify)
{
char buff[FN_REFLEN + MYSQL_ERRMSG_SIZE];
@@ -4256,8 +4255,6 @@ bool mysql_checksum_table(THD *thd, TABLE_LIST *tables, HA_CHECK_OPT *check_opt)
}
else
{
t->pos_in_table_list= table;
if (t->file->table_flags() & HA_HAS_CHECKSUM &&
!(check_opt->flags & T_EXTEND))
protocol->store((ulonglong)t->file->checksum());