laywerrobot/lib/python3.6/site-packages/pandas/tests/io/test_parquet.py
2020-08-27 21:55:39 +02:00

504 lines
17 KiB
Python

""" test parquet compat """
import pytest
import datetime
from distutils.version import LooseVersion
from warnings import catch_warnings
import numpy as np
import pandas as pd
from pandas.compat import PY3, is_platform_windows, is_platform_mac
from pandas.io.parquet import (to_parquet, read_parquet, get_engine,
PyArrowImpl, FastParquetImpl)
from pandas.util import testing as tm
try:
import pyarrow # noqa
_HAVE_PYARROW = True
except ImportError:
_HAVE_PYARROW = False
try:
import fastparquet # noqa
_HAVE_FASTPARQUET = True
except ImportError:
_HAVE_FASTPARQUET = False
# setup engines & skips
@pytest.fixture(params=[
pytest.param('fastparquet',
marks=pytest.mark.skipif(not _HAVE_FASTPARQUET,
reason='fastparquet is '
'not installed')),
pytest.param('pyarrow',
marks=pytest.mark.skipif(not _HAVE_PYARROW,
reason='pyarrow is '
'not installed'))])
def engine(request):
return request.param
@pytest.fixture
def pa():
if not _HAVE_PYARROW:
pytest.skip("pyarrow is not installed")
return 'pyarrow'
@pytest.fixture
def pa_lt_070():
if not _HAVE_PYARROW:
pytest.skip("pyarrow is not installed")
if LooseVersion(pyarrow.__version__) >= LooseVersion('0.7.0'):
pytest.skip("pyarrow is >= 0.7.0")
return 'pyarrow'
@pytest.fixture
def pa_ge_070():
if not _HAVE_PYARROW:
pytest.skip("pyarrow is not installed")
if LooseVersion(pyarrow.__version__) < LooseVersion('0.7.0'):
pytest.skip("pyarrow is < 0.7.0")
return 'pyarrow'
@pytest.fixture
def fp():
if not _HAVE_FASTPARQUET:
pytest.skip("fastparquet is not installed")
return 'fastparquet'
@pytest.fixture
def fp_lt_014():
if not _HAVE_FASTPARQUET:
pytest.skip("fastparquet is not installed")
if LooseVersion(fastparquet.__version__) >= LooseVersion('0.1.4'):
pytest.skip("fastparquet is >= 0.1.4")
return 'fastparquet'
@pytest.fixture
def df_compat():
return pd.DataFrame({'A': [1, 2, 3], 'B': 'foo'})
@pytest.fixture
def df_cross_compat():
df = pd.DataFrame({'a': list('abc'),
'b': list(range(1, 4)),
# 'c': np.arange(3, 6).astype('u1'),
'd': np.arange(4.0, 7.0, dtype='float64'),
'e': [True, False, True],
'f': pd.date_range('20130101', periods=3),
# 'g': pd.date_range('20130101', periods=3,
# tz='US/Eastern'),
# 'h': pd.date_range('20130101', periods=3, freq='ns')
})
return df
@pytest.fixture
def df_full():
return pd.DataFrame(
{'string': list('abc'),
'string_with_nan': ['a', np.nan, 'c'],
'string_with_none': ['a', None, 'c'],
'bytes': [b'foo', b'bar', b'baz'],
'unicode': [u'foo', u'bar', u'baz'],
'int': list(range(1, 4)),
'uint': np.arange(3, 6).astype('u1'),
'float': np.arange(4.0, 7.0, dtype='float64'),
'float_with_nan': [2., np.nan, 3.],
'bool': [True, False, True],
'datetime': pd.date_range('20130101', periods=3),
'datetime_with_nat': [pd.Timestamp('20130101'),
pd.NaT,
pd.Timestamp('20130103')]})
def check_round_trip(df, engine=None, path=None,
write_kwargs=None, read_kwargs=None,
expected=None, check_names=True,
repeat=2):
"""Verify parquet serializer and deserializer produce the same results.
Performs a pandas to disk and disk to pandas round trip,
then compares the 2 resulting DataFrames to verify equality.
Parameters
----------
df: Dataframe
engine: str, optional
'pyarrow' or 'fastparquet'
path: str, optional
write_kwargs: dict of str:str, optional
read_kwargs: dict of str:str, optional
expected: DataFrame, optional
Expected deserialization result, otherwise will be equal to `df`
check_names: list of str, optional
Closed set of column names to be compared
repeat: int, optional
How many times to repeat the test
"""
write_kwargs = write_kwargs or {'compression': None}
read_kwargs = read_kwargs or {}
if expected is None:
expected = df
if engine:
write_kwargs['engine'] = engine
read_kwargs['engine'] = engine
def compare(repeat):
for _ in range(repeat):
df.to_parquet(path, **write_kwargs)
with catch_warnings(record=True):
actual = read_parquet(path, **read_kwargs)
tm.assert_frame_equal(expected, actual,
check_names=check_names)
if path is None:
with tm.ensure_clean() as path:
compare(repeat)
else:
compare(repeat)
def test_invalid_engine(df_compat):
with pytest.raises(ValueError):
check_round_trip(df_compat, 'foo', 'bar')
def test_options_py(df_compat, pa):
# use the set option
with pd.option_context('io.parquet.engine', 'pyarrow'):
check_round_trip(df_compat)
def test_options_fp(df_compat, fp):
# use the set option
with pd.option_context('io.parquet.engine', 'fastparquet'):
check_round_trip(df_compat)
def test_options_auto(df_compat, fp, pa):
# use the set option
with pd.option_context('io.parquet.engine', 'auto'):
check_round_trip(df_compat)
def test_options_get_engine(fp, pa):
assert isinstance(get_engine('pyarrow'), PyArrowImpl)
assert isinstance(get_engine('fastparquet'), FastParquetImpl)
with pd.option_context('io.parquet.engine', 'pyarrow'):
assert isinstance(get_engine('auto'), PyArrowImpl)
assert isinstance(get_engine('pyarrow'), PyArrowImpl)
assert isinstance(get_engine('fastparquet'), FastParquetImpl)
with pd.option_context('io.parquet.engine', 'fastparquet'):
assert isinstance(get_engine('auto'), FastParquetImpl)
assert isinstance(get_engine('pyarrow'), PyArrowImpl)
assert isinstance(get_engine('fastparquet'), FastParquetImpl)
with pd.option_context('io.parquet.engine', 'auto'):
assert isinstance(get_engine('auto'), PyArrowImpl)
assert isinstance(get_engine('pyarrow'), PyArrowImpl)
assert isinstance(get_engine('fastparquet'), FastParquetImpl)
@pytest.mark.xfail(is_platform_windows() or is_platform_mac(),
reason="reading pa metadata failing on Windows/mac")
def test_cross_engine_pa_fp(df_cross_compat, pa, fp):
# cross-compat with differing reading/writing engines
df = df_cross_compat
with tm.ensure_clean() as path:
df.to_parquet(path, engine=pa, compression=None)
result = read_parquet(path, engine=fp)
tm.assert_frame_equal(result, df)
result = read_parquet(path, engine=fp, columns=['a', 'd'])
tm.assert_frame_equal(result, df[['a', 'd']])
def test_cross_engine_fp_pa(df_cross_compat, pa, fp):
# cross-compat with differing reading/writing engines
df = df_cross_compat
with tm.ensure_clean() as path:
df.to_parquet(path, engine=fp, compression=None)
with catch_warnings(record=True):
result = read_parquet(path, engine=pa)
tm.assert_frame_equal(result, df)
result = read_parquet(path, engine=pa, columns=['a', 'd'])
tm.assert_frame_equal(result, df[['a', 'd']])
class Base(object):
def check_error_on_write(self, df, engine, exc):
# check that we are raising the exception on writing
with tm.ensure_clean() as path:
with pytest.raises(exc):
to_parquet(df, path, engine, compression=None)
class TestBasic(Base):
def test_error(self, engine):
for obj in [pd.Series([1, 2, 3]), 1, 'foo', pd.Timestamp('20130101'),
np.array([1, 2, 3])]:
self.check_error_on_write(obj, engine, ValueError)
def test_columns_dtypes(self, engine):
df = pd.DataFrame({'string': list('abc'),
'int': list(range(1, 4))})
# unicode
df.columns = [u'foo', u'bar']
check_round_trip(df, engine)
def test_columns_dtypes_invalid(self, engine):
df = pd.DataFrame({'string': list('abc'),
'int': list(range(1, 4))})
# numeric
df.columns = [0, 1]
self.check_error_on_write(df, engine, ValueError)
if PY3:
# bytes on PY3, on PY2 these are str
df.columns = [b'foo', b'bar']
self.check_error_on_write(df, engine, ValueError)
# python object
df.columns = [datetime.datetime(2011, 1, 1, 0, 0),
datetime.datetime(2011, 1, 1, 1, 1)]
self.check_error_on_write(df, engine, ValueError)
@pytest.mark.parametrize('compression', [None, 'gzip', 'snappy', 'brotli'])
def test_compression(self, engine, compression):
if compression == 'snappy':
pytest.importorskip('snappy')
elif compression == 'brotli':
pytest.importorskip('brotli')
df = pd.DataFrame({'A': [1, 2, 3]})
check_round_trip(df, engine, write_kwargs={'compression': compression})
def test_read_columns(self, engine):
# GH18154
df = pd.DataFrame({'string': list('abc'),
'int': list(range(1, 4))})
expected = pd.DataFrame({'string': list('abc')})
check_round_trip(df, engine, expected=expected,
read_kwargs={'columns': ['string']})
def test_write_index(self, engine):
check_names = engine != 'fastparquet'
if engine == 'pyarrow':
import pyarrow
if LooseVersion(pyarrow.__version__) < LooseVersion('0.7.0'):
pytest.skip("pyarrow is < 0.7.0")
df = pd.DataFrame({'A': [1, 2, 3]})
check_round_trip(df, engine)
indexes = [
[2, 3, 4],
pd.date_range('20130101', periods=3),
list('abc'),
[1, 3, 4],
]
# non-default index
for index in indexes:
df.index = index
check_round_trip(df, engine, check_names=check_names)
# index with meta-data
df.index = [0, 1, 2]
df.index.name = 'foo'
check_round_trip(df, engine)
def test_write_multiindex(self, pa_ge_070):
# Not suppoprted in fastparquet as of 0.1.3 or older pyarrow version
engine = pa_ge_070
df = pd.DataFrame({'A': [1, 2, 3]})
index = pd.MultiIndex.from_tuples([('a', 1), ('a', 2), ('b', 1)])
df.index = index
check_round_trip(df, engine)
def test_write_column_multiindex(self, engine):
# column multi-index
mi_columns = pd.MultiIndex.from_tuples([('a', 1), ('a', 2), ('b', 1)])
df = pd.DataFrame(np.random.randn(4, 3), columns=mi_columns)
self.check_error_on_write(df, engine, ValueError)
def test_multiindex_with_columns(self, pa_ge_070):
engine = pa_ge_070
dates = pd.date_range('01-Jan-2018', '01-Dec-2018', freq='MS')
df = pd.DataFrame(np.random.randn(2 * len(dates), 3),
columns=list('ABC'))
index1 = pd.MultiIndex.from_product(
[['Level1', 'Level2'], dates],
names=['level', 'date'])
index2 = index1.copy(names=None)
for index in [index1, index2]:
df.index = index
check_round_trip(df, engine)
check_round_trip(df, engine, read_kwargs={'columns': ['A', 'B']},
expected=df[['A', 'B']])
class TestParquetPyArrow(Base):
def test_basic(self, pa, df_full):
df = df_full
# additional supported types for pyarrow
import pyarrow
if LooseVersion(pyarrow.__version__) >= LooseVersion('0.7.0'):
df['datetime_tz'] = pd.date_range('20130101', periods=3,
tz='Europe/Brussels')
df['bool_with_none'] = [True, None, True]
check_round_trip(df, pa)
@pytest.mark.xfail(reason="pyarrow fails on this (ARROW-1883)")
def test_basic_subset_columns(self, pa, df_full):
# GH18628
df = df_full
# additional supported types for pyarrow
df['datetime_tz'] = pd.date_range('20130101', periods=3,
tz='Europe/Brussels')
check_round_trip(df, pa, expected=df[['string', 'int']],
read_kwargs={'columns': ['string', 'int']})
def test_duplicate_columns(self, pa):
# not currently able to handle duplicate columns
df = pd.DataFrame(np.arange(12).reshape(4, 3),
columns=list('aaa')).copy()
self.check_error_on_write(df, pa, ValueError)
def test_unsupported(self, pa):
# period
df = pd.DataFrame({'a': pd.period_range('2013', freq='M', periods=3)})
self.check_error_on_write(df, pa, ValueError)
# timedelta
df = pd.DataFrame({'a': pd.timedelta_range('1 day',
periods=3)})
self.check_error_on_write(df, pa, NotImplementedError)
# mixed python objects
df = pd.DataFrame({'a': ['a', 1, 2.0]})
self.check_error_on_write(df, pa, ValueError)
def test_categorical(self, pa_ge_070):
pa = pa_ge_070
# supported in >= 0.7.0
df = pd.DataFrame({'a': pd.Categorical(list('abc'))})
# de-serialized as object
expected = df.assign(a=df.a.astype(object))
check_round_trip(df, pa, expected=expected)
def test_categorical_unsupported(self, pa_lt_070):
pa = pa_lt_070
# supported in >= 0.7.0
df = pd.DataFrame({'a': pd.Categorical(list('abc'))})
self.check_error_on_write(df, pa, NotImplementedError)
def test_s3_roundtrip(self, df_compat, s3_resource, pa):
# GH #19134
check_round_trip(df_compat, pa,
path='s3://pandas-test/pyarrow.parquet')
class TestParquetFastParquet(Base):
def test_basic(self, fp, df_full):
df = df_full
# additional supported types for fastparquet
if LooseVersion(fastparquet.__version__) >= LooseVersion('0.1.4'):
df['datetime_tz'] = pd.date_range('20130101', periods=3,
tz='US/Eastern')
df['timedelta'] = pd.timedelta_range('1 day', periods=3)
check_round_trip(df, fp)
@pytest.mark.skip(reason="not supported")
def test_duplicate_columns(self, fp):
# not currently able to handle duplicate columns
df = pd.DataFrame(np.arange(12).reshape(4, 3),
columns=list('aaa')).copy()
self.check_error_on_write(df, fp, ValueError)
def test_bool_with_none(self, fp):
df = pd.DataFrame({'a': [True, None, False]})
expected = pd.DataFrame({'a': [1.0, np.nan, 0.0]}, dtype='float16')
check_round_trip(df, fp, expected=expected)
def test_unsupported(self, fp):
# period
df = pd.DataFrame({'a': pd.period_range('2013', freq='M', periods=3)})
self.check_error_on_write(df, fp, ValueError)
# mixed
df = pd.DataFrame({'a': ['a', 1, 2.0]})
self.check_error_on_write(df, fp, ValueError)
def test_categorical(self, fp):
if LooseVersion(fastparquet.__version__) < LooseVersion("0.1.3"):
pytest.skip("CategoricalDtype not supported for older fp")
df = pd.DataFrame({'a': pd.Categorical(list('abc'))})
check_round_trip(df, fp)
def test_datetime_tz(self, fp_lt_014):
# fastparquet<0.1.4 doesn't preserve tz
df = pd.DataFrame({'a': pd.date_range('20130101', periods=3,
tz='US/Eastern')})
# warns on the coercion
with catch_warnings(record=True):
check_round_trip(df, fp_lt_014,
expected=df.astype('datetime64[ns]'))
def test_filter_row_groups(self, fp):
d = {'a': list(range(0, 3))}
df = pd.DataFrame(d)
with tm.ensure_clean() as path:
df.to_parquet(path, fp, compression=None,
row_group_offsets=1)
result = read_parquet(path, fp, filters=[('a', '==', 0)])
assert len(result) == 1
def test_s3_roundtrip(self, df_compat, s3_resource, fp):
# GH #19134
check_round_trip(df_compat, fp,
path='s3://pandas-test/fastparquet.parquet')