Equal field propagation is not applied for WHERE varbinary_column>=_utf8'a' COLLATE utf8_general_ci AND varbinary_column='A';

DROP TABLE IF EXISTS t1;

CREATE TABLE t1 (a VARBINARY(10));

INSERT INTO t1 VALUES ('a'),('A');

EXPLAIN EXTENDED SELECT * FROM t1 WHERE a>=_utf8'a' COLLATE utf8_general_ci AND a='A';

SHOW WARNINGS;

+-------+------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

| Note  | 1003 | select `test`.`t1`.`a` AS `a` from `test`.`t1` where ((`test`.`t1`.`a` = 'A') and (convert(`test`.`t1`.`a` using utf8) >= <cache>((_utf8'a' collate utf8_general_ci)))) |

+-------+------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------+