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-rw-r--r--sql/item_subselect.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/sql/item_subselect.h b/sql/item_subselect.h
index 56864109a04..1a407c695b2 100644
--- a/sql/item_subselect.h
+++ b/sql/item_subselect.h
@@ -96,6 +96,7 @@ public:
virtual bool exec();
virtual void fix_length_and_dec();
table_map used_tables() const;
+ table_map not_null_tables() const { return 0; }
bool const_item() const;
inline table_map get_used_tables_cache() { return used_tables_cache; }
inline bool get_const_item_cache() { return const_item_cache; }