SET send_logs_level = 'none'; DROP TABLE IF EXISTS test.test; CREATE TABLE test.test(date Date, id Int8, name String, value Int64, sign Int8) ENGINE = CollapsingMergeTree(sign) ORDER BY (id, date); INSERT INTO test.test VALUES('2000-01-01', 1, 'test string 1', 1, 1); INSERT INTO test.test VALUES('2000-01-01', 2, 'test string 2', 2, 1); SET enable_optimize_predicate_expression = 1; SELECT '-------ENABLE OPTIMIZE PREDICATE-------'; SELECT * FROM (SELECT * FROM test.test FINAL) WHERE id = 1; SELECT * FROM (SELECT * FROM test.test LIMIT 1) WHERE id = 1; SELECT * FROM (SELECT id FROM test.test GROUP BY id LIMIT 1 BY id) WHERE id = 1; SET force_primary_key = 1; SELECT '-------FORCE PRIMARY KEY-------'; SELECT * FROM (SELECT * FROM test.test FINAL) WHERE id = 1; -- { serverError 277 } SELECT * FROM (SELECT * FROM test.test LIMIT 1) WHERE id = 1; -- { serverError 277 } SELECT * FROM (SELECT id FROM test.test GROUP BY id LIMIT 1 BY id) WHERE id = 1; -- { serverError 277 } SELECT '-------CHECK STATEFUL FUNCTIONS-------'; SELECT n, z, changed FROM ( SELECT n, z, runningDifferenceStartingWithFirstValue(n) AS changed FROM ( SELECT ts, n,z FROM system.one ARRAY JOIN [1,3,4,5,6] AS ts, [1,2,2,2,1] AS n, ['a', 'a', 'b', 'a', 'b'] AS z ORDER BY n, ts DESC ) ) WHERE changed = 0; DROP TABLE IF EXISTS test.test;