Merge macbook.local:/Users/kgeorge/mysql/work/mysql-5.0-opt

into  macbook.local:/Users/kgeorge/mysql/work/merge-5.1-opt


mysql-test/r/distinct.result:
  Auto merged
mysql-test/r/gis-rtree.result:
  Auto merged
mysql-test/r/ps.result:
  Auto merged
mysql-test/r/subselect.result:
  Auto merged
mysql-test/r/udf.result:
  Auto merged
mysql-test/t/gis-rtree.test:
  Auto merged
mysql-test/t/ps.test:
  Auto merged
mysql-test/t/subselect.test:
  Auto merged
mysql-test/t/udf.test:
  Auto merged
sql/item_subselect.cc:
  Auto merged
sql/item_subselect.h:
  Auto merged
sql/sql_lex.cc:
  Auto merged
sql/sql_select.cc:
  Auto merged
storage/myisam/mi_check.c:
  Auto merged
sql/sql_udf.cc:
  SCCS merged

1 files changed, 2 insertions, 1 deletions

diff --git a/sql/item_subselect.h b/sql/item_subselect.h
index a5068ff20e0..5a0b2788678 100644
--- a/sql/item_subselect.h
+++ b/sql/item_subselect.h
@@ -363,7 +363,7 @@ public:
   enum Item_result type() { return res_type; }
   enum_field_types field_type() { return res_field_type; }
   virtual void exclude()= 0;
-  bool may_be_null() { return maybe_null; };
+  virtual bool may_be_null() { return maybe_null; };
   virtual table_map upper_select_const_tables()= 0;
   static table_map calc_const_tables(TABLE_LIST *);
   virtual void print(String *str)= 0;
@@ -400,6 +400,7 @@ public:
   void print (String *str);
   bool change_result(Item_subselect *si, select_subselect *result);
   bool no_tables();
+  bool may_be_null();
   bool is_executed() const { return executed; }
   bool no_rows();
 };