Fix of MDEV-511.

As far as we reopen tables so TABLE become invalid we should remove the pointer on cleanup().

1 files changed, 6 insertions, 0 deletions

diff --git a/sql/item.h b/sql/item.h
index 5dde9cf9a3f..6324e900f24 100644
--- a/sql/item.h
+++ b/sql/item.h
@@ -3056,6 +3056,12 @@ public:
     else
       Item_direct_ref::save_in_result_field(no_conversions);
   }
+
+  void cleanup()
+  {
+    null_ref_table= NULL;
+    Item_direct_ref::cleanup();
+  }
 };