`information_schema.cluster_config.*`

show items implemented by

any at least two only one database all databases

relation	column	mysql	mariadb	tidb	postgres	cockroachdb	mssql
`cluster_config`
	`instance`	unsupported	unsupported	`VARCHAR(64) NULL`: 4-6.1	unsupported	unsupported	unsupported
	`key`	unsupported	unsupported	`VARCHAR(256) NULL`: 4-6.1	unsupported	unsupported	unsupported
	`type`	unsupported	unsupported	`VARCHAR(64) NULL`: 4-6.1	unsupported	unsupported	unsupported
	`value`	unsupported	unsupported	`VARCHAR(128) NULL`: 4-6.1	unsupported	unsupported	unsupported