Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/16193
@cloud-fan If the functions in `dapply` and `gapply` might be called as UDF
in SparkR, we have very limited support. In the plan output, it is represented
as `MapPartitionsInR` and `FlatMapGroupsInR`. More strictly, as @davies said,
SparkR does not have actual SQL-level registered UDF.
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