database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-30 16:24:05 +03:00
Code Activity

MDEV-3798: EXPLAIN UPDATE/DELETE

Browse Source 
- Handle the case when EXPLAIN UPDATE/DELETE has pruned away all partitions.
This commit is contained in:
Sergey Petrunya
2013-10-05 13:44:01 +04:00
parent 72bc6d7364
commit abcf14e595
7 changed files with 73 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
sql/sql_delete.cc
View File

@ -83,14 +83,22 @@ void Update_plan::save_explain_data_intern(Explain_query *query,
{
explain->select_type= "SIMPLE";
explain->table_name.append(table->pos_in_table_list->alias);
explain->impossible_where= false;
explain->no_partitions= false;
if (impossible_where)
{
explain->impossible_where= true;
return;
}
explain->impossible_where= false;
if (no_partitions)
{
explain->no_partitions= true;
return;
}
select_lex->set_explain_type(TRUE);
explain->select_type= select_lex->type;
/* Partitions */
@ -139,7 +147,8 @@ void Update_plan::save_explain_data_intern(Explain_query *query,
/* Calculate key_len */
if (select && select->quick)
{
select->quick->add_keys_and_lengths(&explain->key_str, &explain->key_len_str);
select->quick->add_keys_and_lengths(&explain->key_str,
&explain->key_len_str);
}
else
{
@ -356,8 +365,11 @@ bool mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
if (prune_partitions(thd, table, conds))
{
free_underlaid_joins(thd, select_lex);
// No matching record
//psergey-explain-todo: No-partitions used EXPLAIN here..
query_plan.set_no_partitions();
if (thd->lex->describe)
goto exit_without_my_ok;
my_ok(thd, 0);
DBUG_RETURN(0);
}