`information_schema.innodb_fields.*`

show items implemented by

any at least two only one database all databases

relation	column	mysql	mariadb	tidb	postgres	cockroachdb	mssql
`innodb_fields`
	`index_id`	`VARBINARY NULL`: 8	unsupported	unsupported	unsupported	unsupported	unsupported
	`name`	`VARCHAR NOT NULL`: 8	unsupported	unsupported	unsupported	unsupported	unsupported
	`pos`	`BIGINT NOT NULL`: 8	unsupported	unsupported	unsupported	unsupported	unsupported