Skip ALTER TABLE ... ENGINE=innodb ROW_FORMAT=DYNAMIC

[breezewish]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

CREATE TABLE x(a int) ENGINE=innodb;
ALTER TABLE x ENGINE=innodb, ROW_FORMAT=DYNAMIC

Ref: OllieJones/index-wp-mysql-for-speed#58

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

SQL executed successfully without reporting errors. No alter is executed.

3. What did you see instead (Required)

Error: This type of ALTER TABLE is currently unsupported

4. What is your TiDB version? (Required)

v7.1.0