fix of yet another join_free bug

decreased number of check of "!join->select_lex->dependent"


mysql-test/r/subselect.result:
  test of yet another join_free bug
mysql-test/t/subselect.test:
  test of yet another join_free bug

mysql-test/r/subselect.result

@@ -220,3 +220,24 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 2	SUBSELECT								No tables used
 3	UNION								No tables used
 drop table searchconthardwarefr3;
+drop table if exists forumconthardwarefr7, searchconthardwarefr7;
+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);
+CREATE TABLE `searchconthardwarefr7` (
+`mot` varchar(30) NOT NULL default '',
+`topic` mediumint(8) unsigned NOT NULL default '0',
+`date` date NOT NULL default '0000-00-00',
+`pseudo` varchar(35) NOT NULL default '',
+PRIMARY KEY  (`mot`,`pseudo`,`date`,`topic`)
+) TYPE=MyISAM ROW_FORMAT=DYNAMIC;
+INSERT INTO searchconthardwarefr7 (mot,topic,date,pseudo) VALUES ('joce','40143','2002-10-22','joce'), ('joce','43506','2002-10-22','joce');
+SELECT numeropost,maxnumrep FROM forumconthardwarefr7 WHERE exists (SELECT 1 FROM searchconthardwarefr7 WHERE (mot='joce') AND date >= '2002-10-21' AND forumconthardwarefr7.numeropost = searchconthardwarefr7.topic) ORDER BY maxnumrep DESC LIMIT 0, 20;
+numeropost	maxnumrep
+43506	2
+40143	1
+drop table forumconthardwarefr7, searchconthardwarefr7;

mysql-test/t/subselect.test

@@ -115,3 +115,27 @@ SELECT 1 FROM searchconthardwarefr3 WHERE 1=(SELECT 1 UNION SELECT 1) UNION ALL
 SELECT 1 FROM searchconthardwarefr3 WHERE 1=(SELECT 1 UNION ALL SELECT 1) UNION SELECT 1;
 EXPLAIN SELECT 1 FROM searchconthardwarefr3 WHERE 1=(SELECT 1 UNION SELECT 1);
 drop table searchconthardwarefr3;
+
+drop table if exists forumconthardwarefr7, searchconthardwarefr7;
+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);
+
+CREATE TABLE `searchconthardwarefr7` (
+      `mot` varchar(30) NOT NULL default '',
+      `topic` mediumint(8) unsigned NOT NULL default '0',
+      `date` date NOT NULL default '0000-00-00',
+      `pseudo` varchar(35) NOT NULL default '',
+       PRIMARY KEY  (`mot`,`pseudo`,`date`,`topic`)
+    ) TYPE=MyISAM ROW_FORMAT=DYNAMIC;
+
+INSERT INTO searchconthardwarefr7 (mot,topic,date,pseudo) VALUES ('joce','40143','2002-10-22','joce'), ('joce','43506','2002-10-22','joce');
+
+SELECT numeropost,maxnumrep FROM forumconthardwarefr7 WHERE exists (SELECT 1 FROM searchconthardwarefr7 WHERE (mot='joce') AND date >= '2002-10-21' AND forumconthardwarefr7.numeropost = searchconthardwarefr7.topic) ORDER BY maxnumrep DESC LIMIT 0, 20;
+
+drop table forumconthardwarefr7, searchconthardwarefr7;
\ No newline at end of file

sql/sql_select.cc

@@ -2911,6 +2911,23 @@ join_free(JOIN *join)
     */
     if (join->tables > join->const_tables) // Test for not-const tables
       free_io_cache(join->table[join->const_tables]);
+    if (join->select_lex->dependent)
+      for (tab=join->join_tab,end=tab+join->tables ; tab != end ; tab++)
+      {
+	if (tab->table)
+	{
+	  if (tab->table->key_read)
+	  {
+	    tab->table->key_read= 0;
+	    tab->table->file->extra(HA_EXTRA_NO_KEYREAD);
+	  }
+	  /* Don't free index if we are using read_record */
+	  if (!tab->read_record.table)
+	    tab->table->file->index_end();
+	}
+      }
+    else
+    {
       for (tab=join->join_tab,end=tab+join->tables ; tab != end ; tab++)
       {
 	delete tab->select;
@@ -2920,7 +2937,7 @@ join_free(JOIN *join)
 	{
 	  if (tab->table->key_read)
 	  {
-	  tab->table->key_read=0;
+	    tab->table->key_read= 0;
 	    tab->table->file->extra(HA_EXTRA_NO_KEYREAD);
 	  }
 	  /* Don't free index if we are using read_record */
@@ -2929,9 +2946,8 @@ join_free(JOIN *join)
 	}
 	end_read_record(&tab->read_record);
       }
-    //TODO: is enough join_free at the end of mysql_select?
-    if (!join->select_lex->dependent)
-      join->table=0;
+      join->table= 0;
+    }
   }
   /*
     We are not using tables anymore