diff options
Diffstat (limited to 'sql/item_subselect.h')
| -rw-r--r-- | sql/item_subselect.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/sql/item_subselect.h b/sql/item_subselect.h index d18db4aab86..6669027338e 100644 --- a/sql/item_subselect.h +++ b/sql/item_subselect.h @@ -618,6 +618,15 @@ public: bool expr_cache_is_needed(THD *thd); inline bool left_expr_has_null(); + void disable_cond_guard_for_const_null_left_expr(int i) + { + if (left_expr->const_item() && !left_expr->is_expensive()) + { + if (left_expr->element_index(i)->is_null()) + set_cond_guard_var(i,FALSE); + } + } + int optimize(double *out_rows, double *cost); /* Return the identifier that we could use to identify the subquery for the |