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| author | Sergei Golubchik <serg@mariadb.org> | 2017-03-30 12:48:42 +0200 |
|---|---|---|
| committer | Sergei Golubchik <serg@mariadb.org> | 2017-03-30 12:48:42 +0200 |
| commit | da4d71d10d23c1ac2d10b72baee14991ccb7a146 (patch) | |
| tree | 7cdf3a8c8e72ca7c1c8105427c04123f025bd870 /sql/item_subselect.h | |
| parent | 9ec85009985d644ce7ae797bc3572d0ad0f69bb0 (diff) | |
| parent | a00517ac9707ffd51c092f5af5d198c5ee789bb4 (diff) | |
| download | mariadb-git-da4d71d10d23c1ac2d10b72baee14991ccb7a146.tar.gz | |
Merge branch '10.1' into 10.2
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 805e8958246..aa01f571a3d 100644 --- a/sql/item_subselect.h +++ b/sql/item_subselect.h @@ -633,6 +633,15 @@ 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 |