Github user ueshin commented on the issue:
https://github.com/apache/spark/pull/19872
@icexelloss I'm sorry for the late response.
Actually I tried to implement prototypes of Pandas UDAF with partial
aggregation and combining existing aggregate functions, but they are still much
complicated (https://github.com/ueshin/apache-spark/pull/2,
https://github.com/ueshin/apache-spark/pull/3,
https://github.com/ueshin/apache-spark/pull/4). I was thinking about easier way
to achieve that but not yet.
I've not looked into this pr yet but I guess we can start this pr and pick
some functionalities from my prototypes if needed.
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