Bug #28733170
PERFORMANCE_SCHEMA.DATA_LOCKS DOES NOT HANDLE JOINS CORRECTLY
CREATE TABLE t1(
id INT PRIMARY KEY
) Engine=InnoDB;
INSERT INTO t1 VALUES (1);
BEGIN;
SELECT * FROM t1 WHERE id=1 FOR SHARE;
id
1
SELECT * FROM t1 WHERE id=1 FOR UPDATE;
id
1
CREATE TABLE t2 (
id INT PRIMARY KEY AUTO_INCREMENT,
lock_id VARCHAR(200) NOT NULL
) Engine=InnoDB;
INSERT INTO t2 (lock_id)
SELECT engine_lock_id
FROM performance_schema.data_locks
WHERE object_name='t1';
SELECT COUNT(*) FROM t2;
COUNT(*)
4
SELECT COUNT(t2.id)
FROM t2
JOIN performance_schema.data_locks dl
ON(dl.engine_lock_id = t2.lock_id)
ORDER BY t2.id;
COUNT(t2.id)
4
DROP TABLE t2;
ROLLBACK;
DROP TABLE t1;