CREATE TABLE t1 (pk INT PRIMARY KEY, a INT, b CHAR(1), KEY(a), KEY(a,b)) 

  ENGINE=LevelDB;

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

EXPLAIN EXTENDED SELECT MAX(a) FROM t1 WHERE a < 100;

id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra

1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No matching min/max row

Warnings:

Note	1003	/* select#1 */ select max(`test`.`t1`.`a`) AS `MAX(a)` from `test`.`t1` where (`test`.`t1`.`a` < 100)

SELECT MAX(a) FROM t1 WHERE a < 100;

MAX(a)

NULL

CREATE TABLE t1 (pk INT PRIMARY KEY, a INT, b CHAR(1), KEY(a), KEY(a,b)) 

  ENGINE=LevelDB;

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

SELECT MAX(a) FROM t1 WHERE a < 100;

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

revno: 4511

branch-nick: mysql-5.6-leveldb