Merge remote-tracking branch 'origin/10.2' into bb-10.2-ext

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); }