fixing wrong value for "examined rows" when UNION's are used.

mysql-test/r/union.result:
  result for a test case for the wrong examined rows with UNION's
mysql-test/t/union.test:
  test case for the wrong examined rows with UNION's
sql/sql_union.cc:
  a patch for the wrong examined rows with UNION's

1 files changed, 16 insertions, 0 deletions

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');