Github user maropu commented on the issue:
https://github.com/apache/spark/pull/17685
Anybody knows why [we cannot use non-deterministic expressions on grouping
keys](https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala#L269)?
In [some test
cases](https://github.com/apache/spark/blob/master/sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/HiveUDFSuite.scala#L557),
we intend to use this kind of queries. cc: @cloud-fan
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