CREATE TABLE t1 (pk INT PRIMARY KEY, a INT, KEY(a)) ENGINE=LevelDB;

INSERT INTO t1 VALUES (1,10),(2,20);

EXPLAIN EXTENDED

SELECT 3 IN ( SELECT a FROM t1 );

id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra

1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used

2	DEPENDENT SUBQUERY	t1	index_subquery	a	a	5	const	20	100.00	Using index

Warnings:

Note	1003	/* select#1 */ select <in_optimizer>(3,<exists>(<index_lookup>(<cache>(3) in t1 on a checking NULL having <is_not_null_test>(`test`.`t1`.`a`)))) AS `3 IN ( SELECT a FROM t1 )`

SELECT 3 IN ( SELECT a FROM t1 );

3 IN ( SELECT a FROM t1 )

1

CREATE TABLE t1 (pk INT PRIMARY KEY, a INT, KEY(a)) ENGINE=LevelDB;

INSERT INTO t1 VALUES (1,10),(2,20);

SELECT 3 IN ( SELECT a FROM t1 );

revision-id: psergey@askmonty.org-20130124165745-nm4yaxrsu8e4o2ll

revno: 4511

branch-nick: mysql-5.6-leveldb