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Posted to github@datafusion.apache.org by "Michael-J-Ward (via GitHub)" <gi...@apache.org> on 2024/10/11 20:19:00 UTC
[I] Add `PyScalarUDF` and convert `PyScalarUDF` to API recommended upstream [datafusion-python]
Michael-J-Ward opened a new issue, #907:
URL: https://github.com/apache/datafusion-python/issues/907
**Is your feature request related to a problem or challenge? Please describe what you are trying to do.**
Up until #906, `PyScalarUDF` has used `datafusion_physical_expr::functions` which has been deprecated since [v36](https://github.com/apache/datafusion/pull/8878), and is being removed from the public API in [v43](https://github.com/apache/datafusion/pull/12505).
The [deprecation warning](https://github.com/apache/datafusion/blob/8e8bb89a285c6fe6e8186378b7798d3d213f08f7/datafusion/physical-expr/src/functions.rs#L55) advised:
> Implement your function directly in terms of ColumnarValue or use `ScalarUDF` instead
`datafusion-python` users can not currently implement `ScalarUDF` in that recommended way.
**Describe the solution you'd like**
- Change `PyScalarUDF` to take functions that operate on `ColumnarValue`, as recommended upstream.
- Add `PyScalarUDF` that let's python users continue writing UDF's as they do today.
**Describe alternatives you've considered**
We could remove the ability to write pyarrow UDF's, forcing users to migrate as directed in the deprecation warning.
**Additional context**
It may be useful to review how upstream previously converted functions that use `ArrayRef` to `ScalarUDF`.
https://github.com/apache/datafusion/blob/8e8bb89a285c6fe6e8186378b7798d3d213f08f7/datafusion/physical-expr/src/functions.rs#L79-L122
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Re: [I] Add `PyarrowScalarUDF` and convert `PyScalarUDF` to API recommended upstream [datafusion-python]
Posted by "timsaucer (via GitHub)" <gi...@apache.org>.
timsaucer closed issue #907: Add `PyarrowScalarUDF` and convert `PyScalarUDF` to API recommended upstream
URL: https://github.com/apache/datafusion-python/issues/907
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