westonpace commented on issue #15226:
URL: https://github.com/apache/arrow/issues/15226#issuecomment-1376578323
Casting from duration to `int64` should be a zero-copy operation:
```
>>> import pyarrow as pa
>>> import datetime
>>> arr = pa.array([datetime.timedelta(days=1), datetime.timedelta(hours=1)])
>>> arr
<pyarrow.lib.DurationArray object at 0x7f6efa8e60e0>
[
86400000000,
3600000000
]
>>> arr.cast(pa.int64())
<pyarrow.lib.Int64Array object at 0x7f6e6edc86a0>
[
86400000000,
3600000000
]
```
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