def test_filesystem_factory(mockfs, paths_or_selector):
format = ds.ParquetFileFormat(reader_options=dict(dict_columns={"str"}))
options = ds.FileSystemFactoryOptions('subdir')
options.partitioning = ds.DirectoryPartitioning(
pa.schema(
[pa.field('group', pa.int32()),
pa.field('key', pa.string())]))
assert options.partition_base_dir == 'subdir'
assert options.ignore_prefixes == ['.', '_']
assert options.exclude_invalid_files is False
factory = ds.FileSystemDatasetFactory(mockfs, paths_or_selector, format,
options)
inspected_schema = factory.inspect()
assert factory.inspect().equals(pa.schema([
pa.field('i64', pa.int64()),
pa.field('f64', pa.float64()),
pa.field('str', pa.dictionary(pa.int32(), pa.string())),
pa.field('group', pa.int32()),
pa.field('key', pa.string()),
]),
check_metadata=False)
assert isinstance(factory.inspect_schemas(), list)
assert isinstance(factory.finish(inspected_schema), ds.FileSystemDataset)
assert factory.root_partition.equals(ds.ScalarExpression(True))
dataset = factory.finish()
assert isinstance(dataset, ds.FileSystemDataset)
assert len(list(dataset.scan())) == 2
scanner = ds.Scanner(dataset)
expected_i64 = pa.array([0, 1, 2, 3, 4], type=pa.int64())
expected_f64 = pa.array([0, 1, 2, 3, 4], type=pa.float64())
expected_str = pa.DictionaryArray.from_arrays(
pa.array([0, 1, 2, 3, 4], type=pa.int32()),
pa.array("0 1 2 3 4".split(), type=pa.string()))
for task, group, key in zip(scanner.scan(), [1, 2], ['xxx', 'yyy']):
expected_group_column = pa.array([group] * 5, type=pa.int32())
expected_key_column = pa.array([key] * 5, type=pa.string())
for batch in task.execute():
assert batch.num_columns == 5
assert batch[0].equals(expected_i64)
assert batch[1].equals(expected_f64)
assert batch[2].equals(expected_str)
assert batch[3].equals(expected_group_column)
assert batch[4].equals(expected_key_column)
table = dataset.to_table()
assert isinstance(table, pa.Table)
assert len(table) == 10
assert table.num_columns == 5
def dataset(mockfs):
format = ds.ParquetFileFormat()
selector = fs.FileSelector('subdir', recursive=True)
options = ds.FileSystemFactoryOptions('subdir')
options.partitioning = ds.DirectoryPartitioning(
pa.schema(
[pa.field('group', pa.int32()),
pa.field('key', pa.string())]))
factory = ds.FileSystemSourceFactory(mockfs, selector, format, options)
schema = factory.inspect()
source = factory.finish()
return ds.Dataset([source], schema)
def test_file_system_factory(mockfs, paths_or_selector):
format = ds.ParquetFileFormat()
options = ds.FileSystemFactoryOptions('subdir')
options.partitioning = ds.DirectoryPartitioning(
pa.schema([
pa.field('group', pa.int32()),
pa.field('key', pa.string())
])
)
assert options.partition_base_dir == 'subdir'
assert options.ignore_prefixes == ['.', '_']
assert options.exclude_invalid_files is True
factory = ds.FileSystemSourceFactory(
mockfs, paths_or_selector, format, options
)
inspected_schema = factory.inspect()
assert isinstance(factory.inspect(), pa.Schema)
assert isinstance(factory.inspect_schemas(), list)
assert isinstance(factory.finish(inspected_schema),
ds.FileSystemSource)
assert factory.root_partition.equals(ds.ScalarExpression(True))
source = factory.finish()
assert isinstance(source, ds.Source)
dataset = ds.Dataset([source], inspected_schema)
scanner = dataset.new_scan().finish()
assert len(list(scanner.scan())) == 2
expected_i64 = pa.array([0, 1, 2, 3, 4], type=pa.int64())
expected_f64 = pa.array([0, 1, 2, 3, 4], type=pa.float64())
for task, group, key in zip(scanner.scan(), [1, 2], ['xxx', 'yyy']):
expected_group_column = pa.array([group] * 5, type=pa.int32())
expected_key_column = pa.array([key] * 5, type=pa.string())
for batch in task.execute():
assert batch.num_columns == 4
assert batch[0].equals(expected_i64)
assert batch[1].equals(expected_f64)
assert batch[2].equals(expected_group_column)
assert batch[3].equals(expected_key_column)
table = scanner.to_table()
assert isinstance(table, pa.Table)
assert len(table) == 10
assert table.num_columns == 4
def test_partitioning():
schema = pa.schema(
[pa.field('i64', pa.int64()),
pa.field('f64', pa.float64())])
for klass in [ds.DirectoryPartitioning, ds.HivePartitioning]:
partitioning = klass(schema)
assert isinstance(partitioning, ds.Partitioning)
partitioning = ds.DirectoryPartitioning(
pa.schema(
[pa.field('group', pa.int64()),
pa.field('key', pa.float64())]))
expr = partitioning.parse('/3/3.14')
assert isinstance(expr, ds.Expression)
expected = ds.AndExpression(
ds.ComparisonExpression(ds.CompareOperator.Equal,
ds.FieldExpression('group'),
ds.ScalarExpression(3)),
ds.ComparisonExpression(ds.CompareOperator.Equal,
ds.FieldExpression('key'),
ds.ScalarExpression(3.14)))
assert expr.equals(expected)
with pytest.raises(pa.ArrowInvalid):
partitioning.parse('/prefix/3/aaa')
partitioning = ds.HivePartitioning(
pa.schema(
[pa.field('alpha', pa.int64()),
pa.field('beta', pa.int64())]))
expr = partitioning.parse('/alpha=0/beta=3')
expected = ds.AndExpression(
ds.ComparisonExpression(ds.CompareOperator.Equal,
ds.FieldExpression('alpha'),
ds.ScalarExpression(0)),
ds.ComparisonExpression(ds.CompareOperator.Equal,
ds.FieldExpression('beta'),
ds.ScalarExpression(3)))
assert expr.equals(expected)
