Information_schema.check_constraints possible data leak

create user foo;

create database db;

use db;

create table t1 (a int, b int, CONSTRAINT CHECK (b > 0));

insert into t1 values (1, 2), (2, 3);

grant select (a) on t1 to foo;

show grants for foo;

select * from information_schema.check_constraints;

CONNECT(con1,localhost, foo,, db);

select a from t1;

select * from information_schema.check_constraints;

--CONNECTION DEFAULT;

drop database db;

select * from information_schema.check_constraints;

CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_NAME	CHECK_CLAUSE

def	db	t1	CONSTRAINT_1	`b` > 0