parser compatibility problems

[okJiang]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

run sql

CREATE TABLE `tbl11`(`a` INT(11) NOT NULL, `b` INT(11), PRIMARY KEY (`a`(0))) CHARSET UTF8MB4 COLLATE UTF8MB4_BIN;

2. What did you expect to see? (Required)

ERROR 1391 (HY000): Key part 'a' length cannot be 0

from MySQL

3. What did you see instead (Required)

Query OK, 0 rows affected (0.01 sec)

4. What is your TiDB version? (Required)

Server version: 5.7.25-TiDB-v5.0.2 TiDB Server (Apache License 2.0) Community Edition, MySQL 5.7 compatible

[mjonss]

/assign