Wes McKinney created ARROW-608:
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Summary: [Format] Days since epoch date type
Key: ARROW-608
URL: https://issues.apache.org/jira/browse/ARROW-608
Project: Apache Arrow
Issue Type: New Feature
Components: Format
Reporter: Wes McKinney
While we've decided to make the primary IPC date type be int64 milliseconds
since the UNIX epoch, in many libraries dates are represented as integer
(int32, usually) days since some epoch. In the Python standard library, the
epoch is the year 0:
{code}
>>> d = datetime.date(2017, 1, 17)
>>> d.toordinal()
736346
>>> d.toordinal() / 365
2017
{code}
At least in C++-land, in working on ARROW-452 I ran into the problem of how to
do zero-copy reads of such data, while preserving the metadata to know that the
values are dates. I added a C++-only "date32" type to support this use case
https://github.com/apache/arrow/pull/365
I'm not sure whether we should add a new logical type, but thought it would be
worth bringing up in any case
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