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https://issues.apache.org/jira/browse/ARROW-3911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17660935#comment-17660935
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Rok Mihevc commented on ARROW-3911:
-----------------------------------
This issue has been migrated to [issue
#20524|https://github.com/apache/arrow/issues/20524] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [Python] Deduplicate datetime.date objects in Table.to_pandas internals
> -----------------------------------------------------------------------
>
> Key: ARROW-3911
> URL: https://issues.apache.org/jira/browse/ARROW-3911
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Python
> Reporter: Wes McKinney
> Assignee: Wes McKinney
> Priority: Major
> Fix For: 0.12.0
>
>
> https://github.com/apache/arrow/blob/master/cpp/src/arrow/python/arrow_to_pandas.cc#L631
> In Python 3, {{datetime.date}} objects are 32-bytes in addition to the
> {{PyObject*}}. So when there are many repeated dates, this will save a lot of
> memory in large DataFrame objects
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