fixed unlocking tables during subquery execution (BUG#2048)

mysql-test/r/subselect_innodb.result:
  bug 2048 test
mysql-test/t/subselect_innodb.test:
  bug 2048 test
sql/item_subselect.cc:
  do not unlock tables for subqueries
sql/sql_derived.cc:
  derived table tables can be unlocked
sql/sql_lex.h:
  new interface to pass additional options
sql/sql_union.cc:
  new interface to pass additional options
  do not unlock tables for UNION

1 files changed, 23 insertions, 1 deletions

diff --git a/mysql-test/t/subselect_innodb.test b/mysql-test/t/subselect_innodb.test
index 5e274ecbd5c..360bedf8972 100644
--- a/mysql-test/t/subselect_innodb.test
+++ b/mysql-test/t/subselect_innodb.test
@@ -67,4 +67,26 @@ INSERT INTO t1 VALUES (1),(2),(3);
 INSERT INTO t3 VALUES (1,1),(2,2),(3,3);
 INSERT INTO t2 VALUES (1,1),(2,2),(3,3);
 SELECT distinct p1.processor_id, (SELECT y.yod_id FROM t1 p2, t2 y WHERE p2.processor_id = p1.processor_id and p2.processor_id = y.processor_id) FROM t1 p1;
-drop table t1,t2,t3;
\ No newline at end of file
+drop table t1,t2,t3;
+
+#
+# innodb locking
+#
+CREATE TABLE t1 (
+  id int(11) NOT NULL default '0',
+  b int(11) default NULL,
+  c char(3) default NULL,
+  PRIMARY KEY  (id),
+  KEY t2i1 (b)
+) TYPE=innodb DEFAULT CHARSET=latin1;
+INSERT INTO t1 VALUES (0,0,'GPL'),(1,0,'GPL'),(2,1,'GPL'),(3,2,'GPL');
+CREATE TABLE t2 (
+  id int(11) NOT NULL default '0',
+  b int(11) default NULL,
+  c char(3) default NULL,
+  PRIMARY KEY  (id),
+  KEY t2i (b)
+) TYPE=innodb DEFAULT CHARSET=latin1;
+INSERT INTO t2 VALUES (0,0,'GPL'),(1,0,'GPL'),(2,1,'GPL'),(3,2,'GPL');
+select (select max(id) from t2 where b=1 group by b) as x,b from t1 where b=1;
+drop table t1,t2;