Github user icexelloss commented on the issue:
https://github.com/apache/spark/pull/19872
I end up removing `UDFColumn` class and using the existing `Aggregate`
logical plan for pandas group_agg UDF. This reuses a lot of code being to
existing `Aggregate` and minimize the code changes needed for pandas group_agg
UDF.
The code works and three tests (test_basic, test_alias, test_multiple)
passes now but the code is kind of messy. I am going on vacation next week but
I will clean up the code and move this PR forward when I get back (Dec 16).
Thanks all.
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