DROP TABLE IF EXISTS check_system_tables; -- Check MergeTree declaration in new format CREATE TABLE check_system_tables ( name1 UInt8, name2 UInt8, name3 UInt8 ) ENGINE = MergeTree() ORDER BY name1 PARTITION BY name2 SAMPLE BY name1; SELECT name, partition_key, sorting_key, primary_key, sampling_key FROM system.tables WHERE name = 'check_system_tables' FORMAT PrettyCompactNoEscapes; SELECT name, is_in_partition_key, is_in_sorting_key, is_in_primary_key, is_in_sampling_key FROM system.columns WHERE table = 'check_system_tables' FORMAT PrettyCompactNoEscapes; DROP TABLE IF EXISTS check_system_tables; -- Check VersionedCollapsingMergeTree CREATE TABLE check_system_tables ( date Date, value String, version UInt64, sign Int8 ) ENGINE = VersionedCollapsingMergeTree(sign, version) PARTITION BY date ORDER BY date; SELECT name, partition_key, sorting_key, primary_key, sampling_key FROM system.tables WHERE name = 'check_system_tables' FORMAT PrettyCompactNoEscapes; SELECT name, is_in_partition_key, is_in_sorting_key, is_in_primary_key, is_in_sampling_key FROM system.columns WHERE table = 'check_system_tables' FORMAT PrettyCompactNoEscapes; DROP TABLE IF EXISTS check_system_tables; -- Check MergeTree declaration in old format CREATE TABLE check_system_tables ( Event Date, UserId UInt32, Counter UInt32 ) ENGINE = MergeTree(Event, intHash32(UserId), (Counter, Event, intHash32(UserId)), 8192); SELECT name, partition_key, sorting_key, primary_key, sampling_key FROM system.tables WHERE name = 'check_system_tables' FORMAT PrettyCompactNoEscapes; SELECT name, is_in_partition_key, is_in_sorting_key, is_in_primary_key, is_in_sampling_key FROM system.columns WHERE table = 'check_system_tables' FORMAT PrettyCompactNoEscapes; DROP TABLE IF EXISTS check_system_tables;