`information_schema._pg_foreign_table_columns.*`

show items implemented by

any at least two only one database all databases

relation	column	mysql	mariadb	tidb	postgres	cockroachdb	mssql
`_pg_foreign_table_columns`
	`attfdwoptions`	unsupported	unsupported	unsupported	`ARRAY NULL`: 10-15	unsupported	unsupported
	`attname`	unsupported	unsupported	unsupported	`NAME NULL`: 10-15	unsupported	unsupported
	`nspname`	unsupported	unsupported	unsupported	`NAME NULL`: 10-15	unsupported	unsupported
	`relname`	unsupported	unsupported	unsupported	`NAME NULL`: 10-15	unsupported	unsupported