Github user shivaram commented on the issue:
https://github.com/apache/spark/pull/12836
I don't know what could cause this - Do we have the beginning of the string
? My guess is `MapPartitions` or one of the nodes in the plan is calling
`toString` on a byte Array that contains some R object and that generates all
those numbers.
One possibility could be that using a case class for
`MapPartitionsRWrapper` or `FlatMapGroupsInR` means that the `toString` method
auto generated by scala will try to print all the members of the case class.
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