初版

build/lib/mysql/mysql-test/r/join_outer_innodb.result

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+CREATE TABLE t1 (id int(11) NOT NULL PRIMARY KEY, name varchar(20),
+INDEX (name)) ENGINE=InnoDB;
+CREATE TABLE t2 (id int(11) NOT NULL PRIMARY KEY, fkey int(11),
+FOREIGN KEY (fkey) REFERENCES t2(id)) ENGINE=InnoDB;
+INSERT INTO t1 VALUES (1,'A1'),(2,'A2'),(3,'B');
+INSERT INTO t2 VALUES (1,1),(2,2),(3,2),(4,3),(5,3);
+EXPLAIN
+SELECT COUNT(*) FROM t2 LEFT JOIN t1 ON t2.fkey = t1.id 
+WHERE t1.name LIKE 'A%';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index	PRIMARY,name	name	23	NULL	3	Using where; Using index
+1	SIMPLE	t2	ref	fkey	fkey	5	test.t1.id	1	Using where; Using index
+EXPLAIN
+SELECT COUNT(*) FROM t2 LEFT JOIN t1 ON t2.fkey = t1.id 
+WHERE t1.name LIKE 'A%' OR FALSE;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	index	NULL	fkey	5	NULL	5	Using index
+1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.fkey	1	Using where
+DROP TABLE t1,t2;