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https://issues.apache.org/jira/browse/ARROW-16420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17531130#comment-17531130
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Joris Van den Bossche commented on ARROW-16420:
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Ah, good catch, that's a left-over from when we didn't yet intended to pass
through the {{partitioning}} keyword.
cc [~alenkaf]
> [Python] pq.write_to_dataset always ignores partitioning
> --------------------------------------------------------
>
> Key: ARROW-16420
> URL: https://issues.apache.org/jira/browse/ARROW-16420
> Project: Apache Arrow
> Issue Type: Bug
> Components: Python
> Affects Versions: 8.0.0
> Reporter: David Li
> Priority: Major
>
> The code unconditionally sets {{partitioning}} to None, so the user-supplied
> partitioning is ignored.
> https://github.com/apache/arrow/blob/edf7334fc38ec9bc2e019bf400403e7c61fb585e/python/pyarrow/parquet/__init__.py#L3143-L3146
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