Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/17626
The deterministic of our [Scala udaf has exactly the same
logics](https://github.com/apache/spark/blob/489845f3a0e2a3555b96b6f3dbb984c783b20d97/sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/udaf.scala#L339
) and Hive UDF/UDAF... have the same logics too
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