INSERT INTO FUNCTION file('test_pq', Parquet) SELECT * FROM generateRandom('int64_column Nullable(Int64), tuple_column Tuple(a Nullable(String), b Nullable(Float64), c Tuple(i UInt32, j UInt32)),array_tuple_column Array(Tuple(a Nullable(String), b Nullable(Float64), c Nullable(Int64))), map_tuple_column Map(String, Tuple(a Nullable(String), b Nullable(Float64), c Nullable(Int64)))') limit 1000000 SELECT * FROM file('test_pq', Parquet, 'tuple_column Tuple(a Nullable(String))') Format Null SELECT tuple_column.a FROM file('test_pq', Parquet) Format Null SELECT tuple_column.a FROM file('test_pq', Parquet, 'tuple_column Tuple(a Nullable(String))') Format Null SELECT tuple_column.c.i FROM file('test_pq', Parquet) Format Null SELECT * FROM file('test_pq', Parquet, 'array_tuple_column Array (Tuple(a Nullable(String)))') Format Null SELECT * FROM file('test_pq', Parquet, 'map_tuple_column Map(String, Tuple(a Nullable(String)))') Format Null