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SET @saved_dbug = @@SESSION.debug_dbug;
set session debug_dbug="+d,optimizer_innodb_icp";
CREATE TABLE t1(c1 TIME NOT NULL, c2 TIME NULL, c3 DATE, PRIMARY
KEY(c1), UNIQUE INDEX(c2)) engine=innodb;
INSERT INTO t1 VALUES('8:29:45',NULL,'2009-02-01');
SELECT * FROM t1 WHERE c2 <=> NULL ORDER BY c2 LIMIT 2;
c1 c2 c3
08:29:45 NULL 2009-02-01
SELECT * FROM t1 WHERE c2 <=> NULL ORDER BY c2 LIMIT 2;
c1 c2 c3
08:29:45 NULL 2009-02-01
drop table `t1`;
SET debug_dbug= @saved_dbug;