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EXPLAIN DELETE for MariaDB

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- Backported the code to 10.0-base
- Removed incorrect assert
This commit is contained in:
Sergey Petrunya
2013-02-12 08:20:14 +04:00
parent a555ceb2fb
commit 18fec5128b
13 changed files with 550 additions and 83 deletions
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80
sql/sql_parse.cc
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@ -3212,7 +3212,8 @@ end_with_restore_list:
{
DBUG_ASSERT(first_table == all_tables && first_table != 0);
TABLE_LIST *aux_tables= thd->lex->auxiliary_table_list.first;
multi_delete *del_result;
bool explain= test(lex->describe);
select_result *result;
if ((res= multi_delete_precheck(thd, all_tables)))
break;
@ -3227,37 +3228,72 @@ end_with_restore_list:
if ((res= open_and_lock_tables(thd, all_tables, TRUE, 0)))
break;
MYSQL_MULTI_DELETE_START(thd->query());
if (!explain)
{
MYSQL_MULTI_DELETE_START(thd->query());
}
if ((res= mysql_multi_delete_prepare(thd)))
{
MYSQL_MULTI_DELETE_DONE(1, 0);
if (!explain)
{
MYSQL_MULTI_DELETE_DONE(1, 0);
}
goto error;
}
if (!thd->is_fatal_error &&
(del_result= new multi_delete(aux_tables, lex->table_count)))
if (!thd->is_fatal_error)
{
res= mysql_select(thd, &select_lex->ref_pointer_array,
select_lex->get_table_list(),
select_lex->with_wild,
select_lex->item_list,
select_lex->where,
0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
(ORDER *)NULL,
(select_lex->options | thd->variables.option_bits |
SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK |
OPTION_SETUP_TABLES_DONE) & ~OPTION_BUFFER_RESULT,
del_result, unit, select_lex);
res|= thd->is_error();
MYSQL_MULTI_DELETE_DONE(res, del_result->num_deleted());
if (res)
del_result->abort_result_set();
delete del_result;
if (explain)
{
result= new select_send();
if (thd->send_explain_fields(result))
{
delete result;
result= NULL;
}
select_lex->set_explain_type(FALSE);
}
else
result= new multi_delete(aux_tables, lex->table_count);
if (result)
{
res= mysql_select(thd, &select_lex->ref_pointer_array,
select_lex->get_table_list(),
select_lex->with_wild,
select_lex->item_list,
select_lex->where,
0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
(ORDER *)NULL,
(select_lex->options | thd->variables.option_bits |
SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK |
OPTION_SETUP_TABLES_DONE) & ~OPTION_BUFFER_RESULT,
result, unit, select_lex);
res|= thd->is_error();
if (!explain)
{
MYSQL_MULTI_DELETE_DONE(res, del_result->num_deleted());
}
if (res)
result->abort_result_set(); /* for both DELETE and EXPLAIN DELETE */
else
{
if (explain)
result->send_eof();
}
delete result;
}
}
else
{
res= TRUE; // Error
MYSQL_MULTI_DELETE_DONE(1, 0);
if (!explain)
{
MYSQL_MULTI_DELETE_DONE(1, 0);
}
}
break;
}