Bug#14708: Inconsistent treatment of NULLs in LEFT JOINed FULLTEXT matching without index

Don't rely on table->null_row when no index is used - it may be a multi-table search

mysql-test/r/fulltext_left_join.result

@@ -50,3 +50,20 @@ venue_id	venue_text	dt	name	entity_id
 1	a1	2003-05-23 19:30:00	aberdeen town hall	1
 NULL	a2	2003-05-23 19:30:00	NULL	NULL
 drop table t1,t2;
+create table t1 (id int not null primary key, d char(200) not null, e char(200));
+insert into t1 values (1, 'aword', null), (2, 'aword', 'bword'), (3, 'bword', null), (4, 'bword', 'aword'), (5, 'aword and bword', null);
+select * from t1 where match(d, e) against ('+aword +bword' in boolean mode);
+id	d	e
+2	aword	bword
+4	bword	aword
+5	aword and bword	NULL
+create table t2 (m_id int not null, f char(200), key (m_id));
+insert into t2 values (1, 'bword'), (3, 'aword'), (5, '');
+select * from t1 left join t2 on m_id = id where match(d, e, f) against ('+aword +bword' in boolean mode);
+id	d	e	m_id	f
+1	aword	NULL	1	bword
+2	aword	bword	NULL	NULL
+3	bword	NULL	3	aword
+4	bword	aword	NULL	NULL
+5	aword and bword	NULL	5	
+drop table t1,t2;

mysql-test/t/fulltext_left_join.test

@@ -32,7 +32,7 @@ select match(t1.texte,t1.sujet,t1.motsclefs) against('droit' IN BOOLEAN MODE)
 drop table t1, t2;
 
 #
-# Bug #484, reported by Stephen Brandon <stephen@brandonitconsulting.co.uk>
+# BUG#484, reported by Stephen Brandon <stephen@brandonitconsulting.co.uk>
 #
 
 create table t1 (venue_id int(11) default null, venue_text varchar(255) default null, dt datetime default null) engine=myisam;
@@ -45,4 +45,17 @@ select * from t1 left join t2 on (venue_id = entity_id and match(name) against('
 select * from t1 left join t2 on (venue_id = entity_id and match(name) against('aberdeen')) where dt = '2003-05-23 19:30:00';
 drop table t1,t2;
 
+#
+# BUG#14708
+# Inconsistent treatment of NULLs in LEFT JOINed FULLTEXT matching without index
+#
+
+create table t1 (id int not null primary key, d char(200) not null, e char(200));
+insert into t1 values (1, 'aword', null), (2, 'aword', 'bword'), (3, 'bword', null), (4, 'bword', 'aword'), (5, 'aword and bword', null);
+select * from t1 where match(d, e) against ('+aword +bword' in boolean mode);
+create table t2 (m_id int not null, f char(200), key (m_id));
+insert into t2 values (1, 'bword'), (3, 'aword'), (5, '');
+select * from t1 left join t2 on m_id = id where match(d, e, f) against ('+aword +bword' in boolean mode);
+drop table t1,t2;
+
 # End of 4.1 tests

sql/item_func.cc

@@ -4482,7 +4482,7 @@ double Item_func_match::val_real()
   if (ft_handler == NULL)
     DBUG_RETURN(-1.0);
 
-  if (table->null_row) /* NULL row from an outer join */
+  if (key != NO_SUCH_KEY && table->null_row) /* NULL row from an outer join */
     return 0.0;
 
   if (join_key)