diff --git a/mysql-test/r/union.result b/mysql-test/r/union.result
index 1eb978b1bd6..f07bdad9021 100644
--- a/mysql-test/r/union.result
+++ b/mysql-test/r/union.result
@@ -872,6 +872,22 @@ count(*)
 show status like 'Slow_queries';
 Variable_name	Value
 Slow_queries	3
+flush status;
+select a from t1 where b not in (1,2,3) union select a from t1 where b not in (4,5,6);
+a
+4
+5
+3
+6
+7
+8
+9
+10
+1
+2
+show status like 'Slow_queries';
+Variable_name	Value
+Slow_queries	1
 drop table t1;
 create table t1 (   RID int(11) not null default '0',   IID int(11) not null default '0',    nada varchar(50)  not null,NAME varchar(50) not null,PHONE varchar(50) not null) engine=MyISAM;
 insert into t1 ( RID,IID,nada,NAME,PHONE) values (1, 1, 'main', 'a', '111'), (2, 1, 'main', 'b', '222'), (3, 1, 'main', 'c', '333'), (4, 1, 'main', 'd', '444'), (5, 1, 'main', 'e', '555'), (6, 2, 'main', 'c', '333'), (7, 2, 'main', 'd', '454'), (8, 2, 'main', 'e', '555'), (9, 2, 'main', 'f', '666'), (10, 2, 'main', 'g', '777');
diff --git a/mysql-test/t/union.test b/mysql-test/t/union.test
index 468a88b83db..8682808f3f3 100644
--- a/mysql-test/t/union.test
+++ b/mysql-test/t/union.test
@@ -481,6 +481,10 @@ select count(*) from t1 where b=13 union select count(*) from t1 where a=7;
 show status like 'Slow_queries';
 select count(*) from t1 where a=7 union select count(*) from t1 where b=13;
 show status like 'Slow_queries';
+# additional test for examined rows
+flush status;
+select a from t1 where b not in (1,2,3) union select a from t1 where b not in (4,5,6); 
+show status like 'Slow_queries';
 drop table t1;
 
 #
diff --git a/sql/sql_union.cc b/sql/sql_union.cc
index f89b234f5b0..027a21db7ac 100644
--- a/sql/sql_union.cc
+++ b/sql/sql_union.cc
@@ -466,11 +466,14 @@ int st_select_lex_unit::exec()
 	}
 	res= sl->join->error;
 	offset_limit_cnt= sl->offset_limit;
-	if (!res && union_result->flush())
+	if (!res)
 	{
-          examined_rows+= thd->examined_row_count;
-	  thd->lex->current_select= lex_select_save;
-	  DBUG_RETURN(1);
+	  examined_rows+= thd->examined_row_count;
+	  if (union_result->flush())
+	  {
+	    thd->lex->current_select= lex_select_save;
+	    DBUG_RETURN(1);
+	  }
 	}
       }
       if (res)