Merge weblab.(none):/home/marcsql/TREE/mysql-5.0-base

into  weblab.(none):/home/marcsql/TREE/mysql-5.0-rt-merge

1 files changed, 20 insertions, 0 deletions

diff --git a/sql/item_subselect.h b/sql/item_subselect.h
index 25a0326f8b6..4853d635657 100644
--- a/sql/item_subselect.h
+++ b/sql/item_subselect.h
@@ -126,6 +126,12 @@ public:
   virtual void reset_value_registration() {}
   enum_parsing_place place() { return parsing_place; }
 
+  /**
+    Get the SELECT_LEX structure associated with this Item.
+    @return the SELECT_LEX structure associated with this Item
+  */
+  st_select_lex* get_select_lex();
+
   friend class select_subselect;
   friend class Item_in_optimizer;
   friend bool Item_field::fix_fields(THD *, Item **);
@@ -169,6 +175,20 @@ public:
   bool null_inside();
   void bring_value();
 
+  /**
+    This method is used to implement a special case of semantic tree
+    rewriting, mandated by a SQL:2003 exception in the specification.
+    The only caller of this method is handle_sql2003_note184_exception(),
+    see the code there for more details.
+    Note that this method breaks the object internal integrity, by
+    removing it's association with the corresponding SELECT_LEX,
+    making this object orphan from the parse tree.
+    No other method, beside the destructor, should be called on this
+    object, as it is now invalid.
+    @return the SELECT_LEX structure that was given in the constructor.
+  */
+  st_select_lex* invalidate_and_restore_select_lex();
+
   friend class select_singlerow_subselect;
 };