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https://issues.apache.org/jira/browse/ARROW-9065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17133207#comment-17133207
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Joris Van den Bossche commented on ARROW-9065:
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[~dhirschfeld] thanks for the report
cc [~fsaintjacques] [~bkietz] I am not sure to what extent we want to start
parsing non-primitive types? (certainly for things like dates where you can
have different formats ..)
> [Python] Support parsing date32 in dataset partition folders
> ------------------------------------------------------------
>
> Key: ARROW-9065
> URL: https://issues.apache.org/jira/browse/ARROW-9065
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++, Python
> Reporter: Dave Hirschfeld
> Priority: Minor
>
> I have some data which is partitioned by year/month/date. It would be useful
> if the date could be automatically parsed:
> {code:python}
> In [17]: schema = pa.schema([("year", pa.int16()), ("month", pa.int8()),
> ("day", pa.date32())])
> In [18]: partition = DirectoryPartitioning(schema)
> In [19]: partition.parse("/2020/06/2020-06-08")
> ---------------------------------------------------------------------------
> ArrowNotImplementedError Traceback (most recent call last)
> <ipython-input-19-c227c808b401> in <module>
> ----> 1 partition.parse("/2020/06/2020-06-08")
> ~\envs\dev\lib\site-packages\pyarrow\_dataset.pyx in
> pyarrow._dataset.Partitioning.parse()
> ~\envs\dev\lib\site-packages\pyarrow\error.pxi in
> pyarrow.lib.pyarrow_internal_check_status()
> ~\envs\dev\lib\site-packages\pyarrow\error.pxi in pyarrow.lib.check_status()
> ArrowNotImplementedError: parsing scalars of type date32[day]
> {code}
> Not a big issue since you can just use string and convert, but nevertheless
> it would be nice if it Just Worked
> {code}
> In [22]: schema = pa.schema([("year", pa.int16()), ("month", pa.int8()),
> ("day", pa.string())])
> In [23]: partition = DirectoryPartitioning(schema)
> In [24]: partition.parse("/2020/06/2020-06-08")
> Out[24]: <pyarrow.dataset.AndExpression (((year == 2020:int16) and (month ==
> 6:int8)) and (day == 2020-06-08:string))>
> {code}
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