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EXPLAIN UPDATE/DELETE

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- Make EXPLAIN UPDATE/DELETE work inside SPs
- Return correct error code from mysql_delete()
- EXPLAIN <multi-DELETE> will create a multi_delete object (as it 
  affects the optimization). select_result will be only used for 
  producing EXPLAIN output.
This commit is contained in:
Sergey Petrunya
2013-10-01 17:49:03 +04:00
parent e8eeb2e7f9
commit 6519ca51dd
6 changed files with 43 additions and 39 deletions
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37
sql/sql_parse.cc
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@@ -3332,18 +3332,7 @@ end_with_restore_list:
if (!thd->is_fatal_error)
{
if (explain)
{
result= new select_send();
if (thd->send_explain_fields(result))
{
delete result;
result= NULL;
}
}
else
result= new multi_delete(aux_tables, lex->table_count);
result= new multi_delete(aux_tables, lex->table_count);
if (result)
{
res= mysql_select(thd, &select_lex->ref_pointer_array,
@@ -3362,20 +3351,22 @@ end_with_restore_list:
if (!explain)
{
MYSQL_MULTI_DELETE_DONE(res, del_result->num_deleted());
if (res)
result->abort_result_set(); /* for both DELETE and EXPLAIN DELETE */
}
else
{
result->reset_offset_limit();
thd->lex->query_plan_footprint->print_explain(result,
thd->lex->describe);
}
if (res)
result->abort_result_set(); /* for both DELETE and EXPLAIN DELETE */
else
{
if (explain)
result->send_eof();
if (!res)
{
select_result *result= new select_send();
LEX *lex= thd->lex;
if (thd->send_explain_fields(result) ||
lex->query_plan_footprint->print_explain(result, lex->describe) ||
result->send_eof())
res= 1;
}
else
result->abort_result_set(); /* for both DELETE and EXPLAIN DELETE */
}
delete result;
}