DROP TABLE IF EXISTS test_low_cardinality_string; DROP TABLE IF EXISTS test_low_cardinality_uuid; DROP TABLE IF EXISTS test_low_cardinality_int; CREATE TABLE test_low_cardinality_string (data String) ENGINE MergeTree ORDER BY data; CREATE TABLE test_low_cardinality_uuid (data String) ENGINE MergeTree ORDER BY data; CREATE TABLE test_low_cardinality_int (data String) ENGINE MergeTree ORDER BY data; INSERT INTO test_low_cardinality_string (data) VALUES ('{"a": "hi", "b": "hello", "c": "hola", "d": "see you, bye, bye"}'); INSERT INTO test_low_cardinality_int (data) VALUES ('{"a": 11, "b": 2222, "c": 33333333, "d": 4444444444444444}'); INSERT INTO test_low_cardinality_uuid (data) VALUES ('{"a": "2d49dc6e-ddce-4cd0-afb8-790956df54c4", "b": "2d49dc6e-ddce-4cd0-afb8-790956df54c3", "c": "2d49dc6e-ddce-4cd0-afb8-790956df54c1", "d": "2d49dc6e-ddce-4cd0-afb8-790956df54c1"}'); SELECT JSONExtract(data, 'Tuple( a LowCardinality(String), b LowCardinality(String), c LowCardinality(String), d LowCardinality(String) )') AS json FROM test_low_cardinality_string; SELECT JSONExtract(data, 'Tuple( a LowCardinality(FixedString(20)), b LowCardinality(FixedString(20)), c LowCardinality(FixedString(20)), d LowCardinality(FixedString(20)) )') AS json FROM test_low_cardinality_string; SELECT JSONExtract(data, 'Tuple( a LowCardinality(Int8), b LowCardinality(Int8), c LowCardinality(Int8), d LowCardinality(Int8) )') AS json FROM test_low_cardinality_int; SELECT JSONExtract(data, 'Tuple( a LowCardinality(Int16), b LowCardinality(Int16), c LowCardinality(Int16), d LowCardinality(Int16) )') AS json FROM test_low_cardinality_int; SELECT JSONExtract(data, 'Tuple( a LowCardinality(Int32), b LowCardinality(Int32), c LowCardinality(Int32), d LowCardinality(Int32) )') AS json FROM test_low_cardinality_int; SELECT JSONExtract(data, 'Tuple( a LowCardinality(Int64), b LowCardinality(Int64), c LowCardinality(Int64), d LowCardinality(Int64) )') AS json FROM test_low_cardinality_int; SELECT JSONExtract(data, 'Tuple( a LowCardinality(UUID), b LowCardinality(UUID), c LowCardinality(UUID), d LowCardinality(UUID) )') AS json FROM test_low_cardinality_uuid; DROP TABLE test_low_cardinality_string; DROP TABLE test_low_cardinality_uuid; DROP TABLE test_low_cardinality_int;