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https://issues.apache.org/jira/browse/ARROW-5004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17662026#comment-17662026
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Rok Mihevc commented on ARROW-5004:
-----------------------------------
This issue has been migrated to [issue
#21503|https://github.com/apache/arrow/issues/21503] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [Python] Confusing behaviour with boolean partition keys
> --------------------------------------------------------
>
> Key: ARROW-5004
> URL: https://issues.apache.org/jira/browse/ARROW-5004
> Project: Apache Arrow
> Issue Type: Bug
> Components: Python
> Affects Versions: 0.12.1
> Reporter: Scott Taylor
> Priority: Minor
> Labels: parquet
>
> [https://github.com/apache/arrow/blob/3129732a18210d0c8921b45f79be4f34eadf0cc3/python/pyarrow/parquet.py#L686]
> Here the type of a partition key is converted to match the type of a filter
> variable.
> using the *write_to_dataset* function allows *boolean* partition keys (*True*
> or *False)* but these silently break at the linked line as *bool('False')*
> evaluates as *True*.
> I understand a docstring
> ([https://github.com/apache/arrow/blob/3129732a18210d0c8921b45f79be4f34eadf0cc3/python/pyarrow/parquet.py#L653)]
> refers to only string or int partition variables being supported although
> this is somewhat buried away from the user facing API.
> It may be beneficial to detect the boolean case and raise a warning or to
> ensure the function returns a more intuitive output when partition key is
> *'False'* and the filter variable is *False.*
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