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https://issues.apache.org/jira/browse/ARROW-8115?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joris Van den Bossche resolved ARROW-8115.
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Fix Version/s: 1.0.0
Resolution: Fixed
> [Python] Conversion when mixing NaT and datetime objects not working
> --------------------------------------------------------------------
>
> Key: ARROW-8115
> URL: https://issues.apache.org/jira/browse/ARROW-8115
> Project: Apache Arrow
> Issue Type: Bug
> Components: Python
> Environment: <details>
> [paste the output of ``pd.show_versions()`` here below this line]
> INSTALLED VERSIONS
> ------------------
> commit : None
> python : 3.7.4.final.0
> python-bits : 64
> OS : Windows
> OS-release : 10
> machine : AMD64
> processor : Intel64 Family 6 Model 60 Stepping 3, GenuineIntel
> byteorder : little
> LC_ALL : None
> LANG : None
> LOCALE : None.None
> pandas : 1.0.1
> numpy : 1.18.1
> pytz : 2019.3
> dateutil : 2.8.0
> pip : 20.0.2
> setuptools : 45.2.0.post20200210
> Cython : None
> pytest : 5.3.5
> hypothesis : None
> sphinx : None
> blosc : None
> feather : None
> xlsxwriter : None
> lxml.etree : 4.4.2
> html5lib : 1.0.1
> pymysql : None
> psycopg2 : None
> jinja2 : 2.11.1
> IPython : 7.12.0
> pandas_datareader: None
> bs4 : 4.8.1
> bottleneck : None
> fastparquet : None
> gcsfs : None
> lxml.etree : 4.4.2
> matplotlib : 3.1.2
> numexpr : None
> odfpy : None
> openpyxl : 3.0.3
> pandas_gbq : None
> pyarrow : 0.16.0
> pytables : None
> pytest : 5.3.5
> pyxlsb : None
> s3fs : 0.4.0
> scipy : None
> sqlalchemy : None
> tables : None
> tabulate : None
> xarray : None
> xlrd : 1.2.0
> xlwt : None
> xlsxwriter : None
> numba : None
> </details>
> Reporter: Ilya Orson Sandoval
> Priority: Major
> Fix For: 1.0.0
>
>
> h3. Code Sample
> {code:python}
> import pandas as pd
> df = pd.DataFrame({"date": ["", "2019-05-01"]})
> df.date = pd.to_datetime(df.date).dt.date
> df.to_parquet("issue_NaT_parquet")
> {code}
> h3. Problem description
> The above gives me the following error:
> {code}
> ---------------------------------------------------------------------------
> TypeError Traceback (most recent call last)
> <ipython-input-13-432405bef6ac> in <module>
> ----> 1 df.to_parquet("test.parquet")
> ~\AppData\Local\Continuum\miniconda3\lib\site-packages\pandas\util\_decorators.py
> in wrapper(*args, **kwargs)
> 212 else:
> 213 kwargs[new_arg_name] = new_arg_value
> --> 214 return func(*args, **kwargs)
> 215
> 216 return cast(F, wrapper)
> ~\AppData\Local\Continuum\miniconda3\lib\site-packages\pandas\core\frame.py
> in to_parquet(self, path, engine, compression, index, partition_cols,
> **kwargs)
> 2114 index=index,
> 2115 partition_cols=partition_cols,
> -> 2116 **kwargs,
> 2117 )
> 2118
> ~\AppData\Local\Continuum\miniconda3\lib\site-packages\pandas\io\parquet.py
> in to_parquet(df, path, engine, compression, index, partition_cols, **kwargs)
> 262 index=index,
> 263 partition_cols=partition_cols,
> --> 264 **kwargs,
> 265 )
> 266
> ~\AppData\Local\Continuum\miniconda3\lib\site-packages\pandas\io\parquet.py
> in write(self, df, path, compression, coerce_timestamps, index,
> partition_cols, **kwargs)
> 99 from_pandas_kwargs["preserve_index"] = index
> 100
> --> 101 table = self.api.Table.from_pandas(df, **from_pandas_kwargs)
> 102 if partition_cols is not None:
> 103 self.api.parquet.write_to_dataset(
> ~\AppData\Local\Continuum\miniconda3\lib\site-packages\pyarrow\table.pxi in
> pyarrow.lib.Table.from_pandas()
> ~\AppData\Local\Continuum\miniconda3\lib\site-packages\pyarrow\pandas_compat.py
> in dataframe_to_arrays(df, schema, preserve_index, nthreads, columns, safe)
> 573 if nthreads == 1:
> 574 arrays = [convert_column(c, f)
> --> 575 for c, f in zip(columns_to_convert, convert_fields)]
> 576 else:
> 577 from concurrent import futures
> ~\AppData\Local\Continuum\miniconda3\lib\site-packages\pyarrow\pandas_compat.py
> in <listcomp>(.0)
> 573 if nthreads == 1:
> 574 arrays = [convert_column(c, f)
> --> 575 for c, f in zip(columns_to_convert, convert_fields)]
> 576 else:
> 577 from concurrent import futures
> ~\AppData\Local\Continuum\miniconda3\lib\site-packages\pyarrow\pandas_compat.py
> in convert_column(col, field)
> 558
> 559 try:
> --> 560 result = pa.array(col, type=type_, from_pandas=True,
> safe=safe)
> 561 except (pa.ArrowInvalid,
> 562 pa.ArrowNotImplementedError,
> ~\AppData\Local\Continuum\miniconda3\lib\site-packages\pyarrow\array.pxi in
> pyarrow.lib.array()
> ~\AppData\Local\Continuum\miniconda3\lib\site-packages\pyarrow\array.pxi in
> pyarrow.lib._ndarray_to_array()
> TypeError: an integer is required (got type datetime.date){quote}
> {code}
> h3. Expected Output
> Parquet with null values mixed with date values.
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