MaterializeMySQL -- Code: 47, e.displayText() = DB::Exception: Missing columns

[th997]

mysql

CREATE TABLE datatest.test1 (
  id int(11) NOT NULL AUTO_INCREMENT,
  c1 varchar(32) NOT NULL,
  c2 varchar(32),
  PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4

insert into datatest.`test1`(c1,c2) values ('a','b');
insert into datatest.`test1`(c1) values ('c');

clickhouse (version 21.6.5.37 (official build))

CREATE DATABASE datatest ENGINE = MaterializeMySQL('localhost:3306', 'datatest', 'root', 'xxx');

query

select count(c1) from datatest.test1 where c2='b';

throw error

Code: 47, e.displayText() = DB::Exception: Missing columns: 'c2' while processing query: '_sign = 1, c1, c2', required columns: '_sign' 'c1' 'c2' '_sign' 'c1' 'c2' (version 21.6.5.37 (official build))