Github user zhzhan commented on the issue:
https://github.com/apache/spark/pull/16068
@hvanhovell Thanks for looking at this. We have a big number of UDFs that
have this issue. For example, the UDF gives different result with different
partition/sort, but the UDF is pushdown before the partition/sort, resulting in
unexpected behavior. I will working on finding some test cases for it.
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