`information_schema.engines.comment`

mysql

type: VARCHAR NOT NULL

5.7-8

mariadb

type: NULL

Note:

Storage engine comments.

© 2022 MariaDB

5.1-10.8

type: VARCHAR NOT NULL

Note:

Storage engine comments.

© 2022 MariaDB

10.2-10.7

tidb

type: VARCHAR(80) NULL

Note:

The brief comment on the storage engine.

© 2022 PingCAP

4-6.1

postgres

cockroachdb

mssql