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https://issues.apache.org/jira/browse/ARROW-1718?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16222737#comment-16222737
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ASF GitHub Bot commented on ARROW-1718:
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wesm opened a new pull request #1258: ARROW-1718: [C++/Python] Implement casts
from timestamp to date32/64, properly handle NumPy datetime64[D] -> date32
URL: https://github.com/apache/arrow/pull/1258
This was sort of a can of worms. cc @xhochy @cpcloud @BryanCutler
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> [Python] Implement casts from timestamp to date32/date64 and support in
> Array.from_pandas
> -----------------------------------------------------------------------------------------
>
> Key: ARROW-1718
> URL: https://issues.apache.org/jira/browse/ARROW-1718
> Project: Apache Arrow
> Issue Type: New Feature
> Components: Python
> Reporter: Bryan Cutler
> Assignee: Wes McKinney
> Labels: pull-request-available
> Fix For: 0.8.0
>
>
> When calling {{Array.from_pandas}} with a pandas.Series of dates and
> specifying the desired pyarrow type, an error occurs. If the type is not
> specified then {{from_pandas}} will interpret the data as a timestamp type.
> {code}
> import pandas as pd
> import pyarrow as pa
> import datetime
> arr = pa.array([datetime.date(2017, 10, 23)])
> c = pa.Column.from_array("d", arr)
> s = c.to_pandas()
> print(s)
> # 0 2017-10-23
> # Name: d, dtype: datetime64[ns]
> result = pa.Array.from_pandas(s, type=pa.date32())
> print(result)
> """
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "pyarrow/array.pxi", line 295, in pyarrow.lib.Array.__repr__
> (/home/bryan/git/arrow/python/build/temp.linux-x86_64-2.7/lib.cxx:26221)
> File
> "/home/bryan/.local/lib/python2.7/site-packages/pyarrow-0.7.2.dev21+ng028f2cd-py2.7-linux-x86_64.egg/pyarrow/formatting.py",
> line 28, in array_format
> values.append(value_format(x, 0))
> File
> "/home/bryan/.local/lib/python2.7/site-packages/pyarrow-0.7.2.dev21+ng028f2cd-py2.7-linux-x86_64.egg/pyarrow/formatting.py",
> line 49, in value_format
> return repr(x)
> File "pyarrow/scalar.pxi", line 63, in pyarrow.lib.ArrayValue.__repr__
> (/home/bryan/git/arrow/python/build/temp.linux-x86_64-2.7/lib.cxx:19535)
> File "pyarrow/scalar.pxi", line 137, in pyarrow.lib.Date32Value.as_py
> (/home/bryan/git/arrow/python/build/temp.linux-x86_64-2.7/lib.cxx:20368)
> ValueError: year is out of range
> """
> {code}
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