diff options
Diffstat (limited to 'sql/sql_select.cc')
| -rw-r--r-- | sql/sql_select.cc | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/sql/sql_select.cc b/sql/sql_select.cc index 3d880365d42..332c8a786c5 100644 --- a/sql/sql_select.cc +++ b/sql/sql_select.cc @@ -1211,6 +1211,15 @@ JOIN::prepare(TABLE_LIST *tables_init, COND *conds_init, uint og_num, // simple check that we got usable conds dbug_print_item(conds); + /* + It is hack which force creating EXPLAIN object always on runt-time arena + (because very top JOIN::prepare executes always with runtime arena, but + constant subquery like (SELECT 'x') can be called with statement arena + during prepare phase of top SELECT). + */ + if (!(thd->lex->context_analysis_only & CONTEXT_ANALYSIS_ONLY_PREPARE)) + create_explain_query_if_not_exists(thd->lex, thd->mem_root); + if (select_lex->handle_derived(thd->lex, DT_PREPARE)) DBUG_RETURN(-1); @@ -1661,7 +1670,6 @@ bool JOIN::build_explain() int JOIN::optimize() { int res= 0; - create_explain_query_if_not_exists(thd->lex, thd->mem_root); join_optimization_state init_state= optimization_state; if (select_lex->pushdown_select) { |