`information_schema.metadata_lock_info.*`

show items implemented by

any at least two only one database all databases

relation	column	mysql	mariadb	tidb	postgres	cockroachdb	mssql
`metadata_lock_info`
	`lock_duration`	unsupported	`NULL`: 5.1-10.8	unsupported	unsupported	unsupported	unsupported
	`lock_mode`	unsupported	`NULL`: 5.1-10.8	unsupported	unsupported	unsupported	unsupported
	`lock_type`	unsupported	`NULL`: 5.1-10.8	unsupported	unsupported	unsupported	unsupported
	`table_name`	unsupported	`NULL`: 5.1-10.8	unsupported	unsupported	unsupported	unsupported
	`table_schema`	unsupported	`NULL`: 5.1-10.8	unsupported	unsupported	unsupported	unsupported
	`thread_id`	unsupported	`NULL`: 5.1-10.8	unsupported	unsupported	unsupported	unsupported