psql: support `\d NAME` command: query #6

SELECT oid, stxrelid::pg_catalog.regclass, stxnamespace::pg_catalog.regnamespace::pg_catalog.text AS nsp, stxname,
	pg_catalog.pg_get_statisticsobjdef_columns(oid) AS columns,
	  'd' = any(stxkind) AS ndist_enabled,
	  'f' = any(stxkind) AS deps_enabled,
	  'm' = any(stxkind) AS mcv_enabled,
	stxstattarget
	FROM pg_catalog.pg_statistic_ext
	WHERE stxrelid = '1259'
	ORDER BY nsp, stxname;