timsaucer opened a new pull request, #1299:
URL: https://github.com/apache/datafusion-python/pull/1299
# Which issue does this PR close?
Closes #1172
# Rationale for this change
Since we now have the ability to pass Field information instead of just
DataType with ScalarUDFs, this feature adds similar support for Python written
UDFs. Without this feature you must write your UDFs in rust and expose them to
Python. This enhancement greatly expands the use cases where PyArrow data can
be leveraged.
# What changes are included in this PR?
- Adds a ScalarUDF implementation for python based UDFs instead of relying
on the `create_udf` function
- Adds support for converting to pyarrow array via FFI but including the
Field schema instead of the data type
# Are there any user-facing changes?
This expands on the current API and is backwards compatible.
# TODO
- [ ] Add unit tests
- [ ] Update online documentation
- [ ] Update python signatures (type hints)
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