Github user NarineK commented on the pull request:
https://github.com/apache/spark/pull/12966#issuecomment-217936323
Thanks, @davies !
This means that we cannot implement group-apply using repartitioning.
What would you suggest in this case ?
My previous pull request works fine for one key.
We can try another implementation with groupBy-> agg . In this case I
understand that we will need to implement imperative or declarative aggregate
which most probably will collect the rows in a buffer with the same grouping
column and pass that buffer with the rows to R worker.
Is this what you'd prefer ?
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