diff --git a/sql/sql_lex.h b/sql/sql_lex.h
index 20b796bb1ba..be931c56247 100644
--- a/sql/sql_lex.h
+++ b/sql/sql_lex.h
@@ -296,7 +296,7 @@ protected:
 
   select_result *result;
   int res;
-  ulong describe, found_rows_for_union;
+  ulong found_rows_for_union;
   bool  prepared, // prepare phase already performed for UNION (unit)
     optimized, // optimize phase already performed for UNION (unit)
     executed, // already executed
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index 3decbd62a2c..091bde26b0a 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -862,7 +862,8 @@ JOIN::optimize()
     We only need to do this when we have a simple_order or simple_group
     as in other cases the join is done before the sort.
   */
-  if ((order || group_list) && join_tab[const_tables].type != JT_ALL &&
+  if (const_tables != tables &&
+      (order || group_list) && join_tab[const_tables].type != JT_ALL &&
       join_tab[const_tables].type != JT_FT &&
       (order && simple_order || group_list && simple_group))
   {
diff --git a/sql/sql_union.cc b/sql/sql_union.cc
index de2bb4a786c..93541d66d65 100644
--- a/sql/sql_union.cc
+++ b/sql/sql_union.cc
@@ -377,11 +377,12 @@ int st_select_lex_unit::exec()
       offset_limit_cnt= global_parameters->offset_limit;
       select_limit_cnt= global_parameters->select_limit +
 	global_parameters->offset_limit;
+
       if (select_limit_cnt < global_parameters->select_limit)
 	select_limit_cnt= HA_POS_ERROR;		// no limit
       if (select_limit_cnt == HA_POS_ERROR)
 	options&= ~OPTION_FOUND_ROWS;
-      else if (found_rows_for_union && !describe)
+      else if (found_rows_for_union && !thd->lex.describe)
 	options|= OPTION_FOUND_ROWS;
       fake_select_lex->ftfunc_list= &empty_list;
       fake_select_lex->table_list.link_in_list((byte *)&result_table_list,