DROP TABLE IF EXISTS data_01269; CREATE TABLE data_01269 ( key Int32, value Nullable(Int32), alias UInt8 ALIAS value>0 ) ENGINE = MergeTree() ORDER BY key; INSERT INTO data_01269 VALUES (1, 0); -- after PR#10441 SELECT toTypeName(alias) FROM data_01269; SELECT any(alias) FROM data_01269; -- even without PR#10441 ALTER TABLE data_01269 DROP COLUMN alias; ALTER TABLE data_01269 ADD COLUMN alias UInt8 ALIAS value>0; SELECT toTypeName(alias) FROM data_01269; SELECT any(alias) FROM data_01269; DROP TABLE data_01269;