test of join_free bug

sql/sql_lex.cc:
  possible bug fixed
sql/sql_select.cc:
  fixed join_free bug

mysql-test/r/subselect.result

@@ -195,7 +195,7 @@ joce
 SELECT pseudo FROM inscrit WHERE pseudo=(SELECT pseudo FROM inscrit WHERE pseudo LIKE '%joce%');
 Subselect returns more than 1 record
 drop table if exists t1,t2,t3,t4,t5,attend,clinic,inscrit;
-drop table if exists searchconthardwarefr3;
+drop table if exists searchconthardwarefr3, forumconthardwarefr7;
 CREATE TABLE `searchconthardwarefr3` (
 `topic` mediumint(8) unsigned NOT NULL default '0',
 `date` date NOT NULL default '0000-00-00',
@@ -241,4 +241,12 @@ topic	date	pseudo
 43506	2002-10-02	joce
 SELECT * from searchconthardwarefr3 where topic IN (SELECT SUM(topic) FROM searchconthardwarefr3);
 topic	date	pseudo
-drop table searchconthardwarefr3;
+CREATE TABLE `forumconthardwarefr7` (
+`numeropost` mediumint(8) unsigned NOT NULL auto_increment,
+`maxnumrep` int(10) unsigned NOT NULL default '0',
+PRIMARY KEY  (`numeropost`),
+UNIQUE KEY `maxnumrep` (`maxnumrep`)) TYPE=MyISAM ROW_FORMAT=FIXED;
+INSERT INTO forumconthardwarefr7 (numeropost,maxnumrep) VALUES (40143,1),(43506,2);
+SELECT SQL_CALC_FOUND_ROWS numeropost,maxnumrep FROM forumconthardwarefr7 WHERE numeropost IN (SELECT topic FROM searchconthardwarefr3 WHERE pseudo='joce' AND date >= '2002-10-06') ORDER BY maxnumrep DESC LIMIT 0,20;
+numeropost	maxnumrep
+drop table searchconthardwarefr3, forumconthardwarefr7;

mysql-test/t/subselect.test

@@ -102,7 +102,7 @@ SELECT pseudo FROM inscrit WHERE pseudo=(SELECT pseudo FROM inscrit WHERE pseudo
 
 drop table if exists t1,t2,t3,t4,t5,attend,clinic,inscrit;
 
-drop table if exists searchconthardwarefr3;
+drop table if exists searchconthardwarefr3, forumconthardwarefr7;
 CREATE TABLE `searchconthardwarefr3` (
   `topic` mediumint(8) unsigned NOT NULL default '0',
   `date` date NOT NULL default '0000-00-00',
@@ -125,4 +125,12 @@ SELECT 1 IN (SELECT 1 FROM searchconthardwarefr3 HAVING a);
 SELECT * from searchconthardwarefr3 where topic IN (SELECT topic FROM searchconthardwarefr3 GROUP BY date);
 SELECT * from searchconthardwarefr3 where topic IN (SELECT topic FROM searchconthardwarefr3 GROUP BY date HAVING topic < 4100);
 SELECT * from searchconthardwarefr3 where topic IN (SELECT SUM(topic) FROM searchconthardwarefr3);
-drop table searchconthardwarefr3;
+CREATE TABLE `forumconthardwarefr7` (
\ No newline at end of file
+  `numeropost` mediumint(8) unsigned NOT NULL auto_increment,
+  `maxnumrep` int(10) unsigned NOT NULL default '0',
+  PRIMARY KEY  (`numeropost`),
+  UNIQUE KEY `maxnumrep` (`maxnumrep`)) TYPE=MyISAM ROW_FORMAT=FIXED;
+
+INSERT INTO forumconthardwarefr7 (numeropost,maxnumrep) VALUES (40143,1),(43506,2);
+SELECT SQL_CALC_FOUND_ROWS numeropost,maxnumrep FROM forumconthardwarefr7 WHERE numeropost IN (SELECT topic FROM searchconthardwarefr3 WHERE pseudo='joce' AND date >= '2002-10-06') ORDER BY maxnumrep DESC LIMIT 0,20;
+drop table searchconthardwarefr3, forumconthardwarefr7;
\ No newline at end of file

sql/sql_lex.cc

@@ -927,6 +927,7 @@ void st_select_lex_node::init_query()
 {
   next= master= slave= link_next= 0;
   prev= link_prev= 0;
+  dependent= 0;
 }
 
 void st_select_lex_node::init_select()
@@ -937,7 +938,7 @@ void st_select_lex_node::init_select()
   select_limit= HA_POS_ERROR;
   offset_limit= 0;
   with_sum_func= 0;
-  create_refs= dependent= 0;
+  create_refs= 0;
 }
 
 void st_select_lex_unit::init_query()

sql/sql_select.cc

@@ -2914,10 +2914,13 @@ join_free(JOIN *join)
     if (join->tables > join->const_tables) // Test for not-const tables
       free_io_cache(join->table[join->const_tables]);
     for (tab=join->join_tab,end=tab+join->tables ; tab != end ; tab++)
+    {
+      if (!join->select_lex->dependent)
       {
 	delete tab->select;
 	delete tab->quick;
 	x_free(tab->cache.buff);
+      }
       if (tab->table)
       {
 	if (tab->table->key_read)