Fix for BUG#11869: In Item_func_match::fix_index() handle the case when there is no

  source table present (this happens for ORDER BY after UNION)

mysql-test/r/fulltext_order_by.result

@@ -86,3 +86,77 @@ a	rel
 1	1
 2	2
 drop table t1;
+CREATE TABLE t1 (
+id int(11) NOT NULL auto_increment,
+thread int(11) NOT NULL default '0',
+beitrag longtext NOT NULL,
+PRIMARY KEY  (id),
+KEY thread (thread),
+FULLTEXT KEY beitrag (beitrag)
+) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=7923 ;
+CREATE TABLE t2 (
+id int(11) NOT NULL auto_increment,
+text varchar(100) NOT NULL default '',
+PRIMARY KEY  (id),
+KEY text (text)
+) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=63 ;
+CREATE TABLE t3 (
+id int(11) NOT NULL auto_increment,
+forum int(11) NOT NULL default '0',
+betreff varchar(70) NOT NULL default '',
+PRIMARY KEY  (id),
+KEY forum (forum),
+FULLTEXT KEY betreff (betreff)
+) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=996 ;
+select a.text, b.id, b.betreff
+from 
+t2 a inner join t3 b on a.id = b.forum inner join
+t1 c on b.id = c.thread
+where 
+match(b.betreff) against ('+abc' in boolean mode)
+group by a.text, b.id, b.betreff
+union
+select a.text, b.id, b.betreff
+from 
+t2 a inner join t3 b on a.id = b.forum inner join
+t1 c on b.id = c.thread
+where 
+match(c.beitrag) against ('+abc' in boolean mode)
+group by 
+a.text, b.id, b.betreff
+order by 
+match(b.betreff) against ('+abc' in boolean mode) desc;
+ERROR 42S02: Unknown table 'b' in order clause
+select a.text, b.id, b.betreff
+from 
+t2 a inner join t3 b on a.id = b.forum inner join
+t1 c on b.id = c.thread
+where 
+match(b.betreff) against ('+abc' in boolean mode)
+union
+select a.text, b.id, b.betreff
+from 
+t2 a inner join t3 b on a.id = b.forum inner join
+t1 c on b.id = c.thread
+where 
+match(c.beitrag) against ('+abc' in boolean mode)
+order by 
+match(b.betreff) against ('+abc' in boolean mode) desc;
+ERROR 42S02: Unknown table 'b' in order clause
+select a.text, b.id, b.betreff
+from 
+t2 a inner join t3 b on a.id = b.forum inner join
+t1 c on b.id = c.thread
+where 
+match(b.betreff) against ('+abc' in boolean mode)
+union
+select a.text, b.id, b.betreff
+from 
+t2 a inner join t3 b on a.id = b.forum inner join
+t1 c on b.id = c.thread
+where 
+match(c.beitrag) against ('+abc' in boolean mode)
+order by 
+match(betreff) against ('+abc' in boolean mode) desc;
+text	id	betreff
+drop table t1,t2,t3;

mysql-test/t/fulltext_order_by.test

@@ -54,3 +54,84 @@ SELECT a, MATCH (message) AGAINST ('t* f*' IN BOOLEAN MODE) as rel FROM t1;
 SELECT a, MATCH (message) AGAINST ('t* f*' IN BOOLEAN MODE) as rel FROM t1 ORDER BY rel,a;
 drop table t1;
 
+# BUG#11869
+CREATE TABLE t1 (
+  id int(11) NOT NULL auto_increment,
+  thread int(11) NOT NULL default '0',
+  beitrag longtext NOT NULL,
+  PRIMARY KEY  (id),
+  KEY thread (thread),
+  FULLTEXT KEY beitrag (beitrag)
+) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=7923 ;
+
+CREATE TABLE t2 (
+  id int(11) NOT NULL auto_increment,
+  text varchar(100) NOT NULL default '',
+  PRIMARY KEY  (id),
+  KEY text (text)
+) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=63 ;
+
+CREATE TABLE t3 (
+  id int(11) NOT NULL auto_increment,
+  forum int(11) NOT NULL default '0',
+  betreff varchar(70) NOT NULL default '',
+  PRIMARY KEY  (id),
+  KEY forum (forum),
+  FULLTEXT KEY betreff (betreff)
+) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=996 ;
+
+--error 1109
+select a.text, b.id, b.betreff
+from 
+  t2 a inner join t3 b on a.id = b.forum inner join
+  t1 c on b.id = c.thread
+where 
+  match(b.betreff) against ('+abc' in boolean mode)
+group by a.text, b.id, b.betreff
+union
+select a.text, b.id, b.betreff
+from 
+  t2 a inner join t3 b on a.id = b.forum inner join
+  t1 c on b.id = c.thread
+where 
+  match(c.beitrag) against ('+abc' in boolean mode)
+group by 
+  a.text, b.id, b.betreff
+order by 
+  match(b.betreff) against ('+abc' in boolean mode) desc;
+  
+--error 1109
+select a.text, b.id, b.betreff
+from 
+  t2 a inner join t3 b on a.id = b.forum inner join
+  t1 c on b.id = c.thread
+where 
+  match(b.betreff) against ('+abc' in boolean mode)
+union
+select a.text, b.id, b.betreff
+from 
+  t2 a inner join t3 b on a.id = b.forum inner join
+  t1 c on b.id = c.thread
+where 
+  match(c.beitrag) against ('+abc' in boolean mode)
+order by 
+  match(b.betreff) against ('+abc' in boolean mode) desc;
+
+select a.text, b.id, b.betreff
+from 
+  t2 a inner join t3 b on a.id = b.forum inner join
+  t1 c on b.id = c.thread
+where 
+  match(b.betreff) against ('+abc' in boolean mode)
+union
+select a.text, b.id, b.betreff
+from 
+  t2 a inner join t3 b on a.id = b.forum inner join
+  t1 c on b.id = c.thread
+where 
+  match(c.beitrag) against ('+abc' in boolean mode)
+order by 
+  match(betreff) against ('+abc' in boolean mode) desc;
+
+drop table t1,t2,t3;
+

sql/item_func.cc

@@ -3196,6 +3196,9 @@ bool Item_func_match::fix_index()
 
   if (key == NO_SUCH_KEY)
     return 0;
+  
+  if (!table) 
+    goto err;
 
   for (keynr=0 ; keynr < table->keys ; keynr++)
   {