Github user maropu commented on the issue:
https://github.com/apache/spark/pull/18779
Aha, I see... I'm not sure this is an expected behaviour though, yea, we
might have the compatibility issue as you said. I feel, if we explicitly
support `group-by-ordinal` in dataset apis, the syntax
like `df.groupBy(functions.ordinal(1))` is more consistent with the other
apis (it's a just my thought).
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