jorisvandenbossche commented on pull request #11918:
URL: https://github.com/apache/arrow/pull/11918#issuecomment-989958688
This makes the following already possible (to use in filter or projection
expression in dataset):
```
In [1]: import pyarrow.compute as pc
In [2]: import pyarrow.dataset as ds
In [3]: pc.hour(ds.field("datetime_col"))
Out[3]: <pyarrow.dataset.Expression hour(datetime_col)>
In [4]: pc.days_between(ds.field("col1"), ds.field("col2"))
Out[4]: <pyarrow.dataset.Expression days_between(col1, col2)>
```
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