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MWL#182: Explain running statements

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- Remove out-of-date comments, add dbug assertions.
This commit is contained in:
Sergey Petrunya
2012-06-25 18:39:26 +04:00
parent 45503698c1
commit 66c62de103
6 changed files with 8 additions and 18 deletions
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6
sql/sql_class.cc
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@ -3333,12 +3333,14 @@ void THD::restore_active_arena(Query_arena *set, Query_arena *backup)
void Show_explain_request::get_explain_data(void *arg)
{
Show_explain_request *req= (Show_explain_request*)arg;
//TODO: change mem_root to point to request_thd->mem_root.
// Actually, change the ARENA, because we're going to allocate items!
Query_arena backup_arena;
THD *target_thd= req->target_thd;
bool printed_anything= FALSE;
/*
Change the arena because JOIN::print_explain and co. are going to allocate
items. Let them allocate them on our arena.
*/
target_thd->set_n_backup_active_arena((Query_arena*)req->request_thd,
&backup_arena);