now we create temporary join for all queries with subqueries to make correct cleunup of tables and avoid too early unlock (BUG#6841)

mysql-test/t/subselect_innodb.test:
  possible early unlock
sql/sql_lex.cc:
  subqueries presence flag
sql/sql_lex.h:
  subqueries presence flag
sql/sql_parse.cc:
  subqueries presence flag
sql/sql_select.cc:
  removed some too optimistic optimisation, now we create temporary join for all queries with subqueries to make correct cleunup of tables and avoid too early unlock

1 files changed, 9 insertions, 0 deletions

diff --git a/mysql-test/t/subselect_innodb.test b/mysql-test/t/subselect_innodb.test
index 5f4badb3624..54c56e640dc 100644
--- a/mysql-test/t/subselect_innodb.test
+++ b/mysql-test/t/subselect_innodb.test
@@ -125,3 +125,12 @@ INSERT INTO `t2` VALUES ('yy','xx');
 SELECT R.unit, R.ingredient FROM t1 R WHERE R.ingredient IN (SELECT N.ingredient FROM t2 N WHERE N.unit = R.unit);
 
 drop table t1, t2;
+
+#
+# possible early unlock
+#
+CREATE TABLE t1 ( id INT NOT NULL auto_increment, date1 DATE, coworkerid INT, description VARCHAR(255), sum_used DOUBLE, sum_remaining DOUBLE, comments VARCHAR(255), PRIMARY KEY(id)) engine=innodb;
+insert into t1 values (NULL, '1999-01-01', 1,'test', 22, 33, 'comment'), (NULL, '1999-01-01', 1,'test', 22, 33, 'comment'), (NULL, '1999-01-01', 1,'test', 22, 33, 'comment'), (NULL, '1998-01-01', 1,'test', 22, 33, 'comment'), (NULL, '1998-01-01', 1,'test', 22, 33, 'comment'), (NULL, '2004-01-01', 1,'test', 22, 33, 'comment'), (NULL, '2004-01-01', 1,'test', 22, 33, 'comment');
+SELECT DISTINCT (SELECT sum(sum_used) FROM t1 WHERE sum_used > 0 AND year(date1) <= '2004') as somallontvangsten, (SELECT sum(sum_used) FROM t1 WHERE sum_used < 0 AND year(date1) <= '2004') as somalluitgaven FROM t1;
+select * from t1;
+drop table t1;