Merge 10.0-base -> mwl253.

1 files changed, 19 insertions, 3 deletions

diff --git a/sql/sql_select.h b/sql/sql_select.h
index 87c09611009..d52d312f14b 100644
--- a/sql/sql_select.h
+++ b/sql/sql_select.h
@@ -1,8 +1,8 @@
 #ifndef SQL_SELECT_INCLUDED
 #define SQL_SELECT_INCLUDED
 
-/* Copyright (c) 2000, 2011, Oracle and/or its affiliates.
-   Copyright (c) 2008-2011 Monty Program Ab
+/* Copyright (c) 2000, 2013, Oracle and/or its affiliates.
+   Copyright (c) 2008, 2013, Monty Program Ab.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -525,6 +525,16 @@ typedef struct st_join_table {
   bool preread_init();
 
   bool is_sjm_nest() { return test(bush_children); }
+
+  bool access_from_tables_is_allowed(table_map used_tables,
+                                     table_map sjm_lookup_tables)
+  {
+    table_map used_sjm_lookup_tables= used_tables & sjm_lookup_tables;
+    return !used_sjm_lookup_tables ||
+           (emb_sj_nest && 
+            !(used_sjm_lookup_tables & ~emb_sj_nest->sj_inner_tables));
+  }
+
 } JOIN_TAB;
 
 
@@ -977,6 +987,11 @@ public:
   bool     hash_join;
   bool	   do_send_rows;
   table_map const_table_map;
+  /** 
+    Bitmap of semijoin tables that the current partial plan decided
+    to materialize and access by lookups
+  */
+  table_map sjm_lookup_tables;
   /*
     Constant tables for which we have found a row (as opposed to those for
     which we didn't).
@@ -1308,8 +1323,9 @@ public:
     outer_ref_cond= pseudo_bits_cond= NULL;
     in_to_exists_where= NULL;
     in_to_exists_having= NULL;
-
     pre_sort_join_tab= NULL;
+    emb_sjm_nest= NULL;
+    sjm_lookup_tables= 0;
   }
 
   int prepare(Item ***rref_pointer_array, TABLE_LIST *tables, uint wind_num,