Bug#22331: Wrong WHERE in EXPLAIN EXTENDED when all expressions were optimized

away.

Additional fix for bug#22331. Now Item_field prints its value in the case of
the const field.

1 files changed, 6 insertions, 0 deletions

diff --git a/sql/sql_union.cc b/sql/sql_union.cc
index 16df0059217..1ec724a6338 100644
--- a/sql/sql_union.cc
+++ b/sql/sql_union.cc
@@ -621,6 +621,12 @@ bool st_select_lex_unit::cleanup()
       join->tables= 0;
     }
     error|= fake_select_lex->cleanup();
+    if (fake_select_lex->order_list.elements)
+    {
+      ORDER *ord;
+      for (ord= (ORDER*)fake_select_lex->order_list.first; ord; ord= ord->next)
+        (*ord->item)->cleanup();
+    }
   }
 
   DBUG_RETURN(error);