xinrong-meng opened a new pull request, #39860:
URL: https://github.com/apache/spark/pull/39860
TODO:
- [ ] code cleanup for `spark.register_udf`
- [ ] rename CommonInlineUserDefinedFunction to CommonUserDefinedFunction
- [ ] unit tests
- [ ] docstrings
### What changes were proposed in this pull request?
Standardize registered pickled Python UDFs, specifically, implement
`spark.udf.register()`.
```py
>>> spark.udf
<pyspark.sql.connect.udf.UDFRegistration object at 0x7fbca0077dc0>
>>> f = spark.udf.register("f", lambda x: x+1, "int")
>>> f
<function <lambda> at 0x7fbc905e5e50>
>>> spark.sql("SELECT f(id) FROM range(2)").collect()
[Row(f(id)=1), Row(f(id)=2)]
```
### Why are the changes needed?
To reach parity with vanilla PySpark.
### Does this PR introduce _any_ user-facing change?
Yes. `spark.register_udf` is removed, whereas `spark.udf.register()` is
added.
### How was this patch tested?
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