diff options
Diffstat (limited to 'sql/item_subselect.h')
| -rw-r--r-- | sql/item_subselect.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/sql/item_subselect.h b/sql/item_subselect.h index cb60b646979..6112c1c22f4 100644 --- a/sql/item_subselect.h +++ b/sql/item_subselect.h @@ -505,6 +505,8 @@ public: Item *left_expr_orig; /* Priority of this predicate in the convert-to-semi-join-nest process. */ int sj_convert_priority; + /* May be TRUE only for the candidates to semi-join conversion */ + bool do_not_convert_to_sj; /* Types of left_expr and subquery's select list allow to perform subquery materialization. Currently, we set this to FALSE when it as well could @@ -595,8 +597,8 @@ public: Item_in_subselect(THD *thd_arg): Item_exists_subselect(thd_arg), left_expr_cache(0), first_execution(TRUE), in_strategy(SUBS_NOT_TRANSFORMED), - pushed_cond_guards(NULL), func(NULL), is_jtbm_merged(FALSE), - is_jtbm_const_tab(FALSE), upper_item(0) {} + pushed_cond_guards(NULL), func(NULL), do_not_convert_to_sj(FALSE), + is_jtbm_merged(FALSE), is_jtbm_const_tab(FALSE), upper_item(0) {} void cleanup(); subs_type substype() { return IN_SUBS; } void reset() @@ -651,6 +653,8 @@ public: */ int get_identifier(); + void block_conversion_to_sj () { do_not_convert_to_sj= TRUE; } + bool test_strategy(uchar strategy) { return MY_TEST(in_strategy & strategy); } |