DROP TABLE IF EXISTS t; DROP TABLE IF EXISTS t2; CREATE TABLE t (x int) ENGINE = MergeTree() ORDER BY (); DELETE FROM t WHERE y in (SELECT x FROM t); -- { serverError UNKNOWN_IDENTIFIER } DELETE FROM t WHERE x in (SELECT y FROM t); -- { serverError UNKNOWN_IDENTIFIER } DELETE FROM t WHERE x IN (SELECT * FROM t2); -- { serverError UNKNOWN_TABLE } ALTER TABLE t DELETE WHERE x in (SELECT y FROM t); -- { serverError UNKNOWN_IDENTIFIER } ALTER TABLE t UPDATE x = 1 WHERE x IN (SELECT y FROM t); -- { serverError UNKNOWN_IDENTIFIER } DELETE FROM t WHERE x IN (SELECT foo FROM bar) SETTINGS validate_mutation_query = 0; ALTER TABLE t ADD COLUMN y int; DELETE FROM t WHERE y in (SELECT y FROM t); CREATE TABLE t2 (x int) ENGINE = MergeTree() ORDER BY (); DELETE FROM t WHERE x IN (SELECT * FROM t2); DROP TABLE t; DROP TABLE t2;