Wes McKinney created ARROW-3911:
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Summary: [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
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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