lidavidm commented on pull request #10933:
URL: https://github.com/apache/arrow/pull/10933#issuecomment-901351526
There's already a cast from timestamp to date32/date64, however, placing
this implementation there would change semantics a little bit:
```
>>> timestamps
<pyarrow.lib.TimestampArray object at 0x7f676cd86fa0>
[
1970-01-01 00:00:59.123456789,
2000-02-29 23:23:23.999999999,
1899-01-01 00:59:20.001001001
]
>>> timestamps.cast(pa.date64(), safe=False)
<pyarrow.lib.Date64Array object at 0x7f676cf277c0>
[
1970-01-01,
2000-02-29,
1899-01-02
]
>>> pc.date64(timestamps)
<pyarrow.lib.Date64Array object at 0x7f676cf27d00>
[
1970-01-01,
2000-02-29,
1899-01-01
]
```
Also Python doesn't expose a way to set only allow_time_truncate (though
maybe we should just allow the cast if we refactor things here). But that does
raise the question of whether a cast is appropriate for this operation (since
it seems like casting is generally interpreted more like reinterpret_cast,
while this is an actual conversion). Also for instance a cast of a
timestamp-with-timezone right now is quite different than what this does.
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