`information_schema.statistics.comment`

mysql

type: VARCHAR NOT NULL

8

type: VARCHAR NULL

5.7

mariadb

type: NULL

Note:

Index comments from the CREATE INDEX statement.

© 2022 MariaDB

5.1-10.8

tidb

type: VARCHAR(16) NULL

Note:

Other information related to the index.

© 2022 PingCAP

4-6.1

postgres

cockroachdb

mssql