Github user NarineK commented on the issue:
https://github.com/apache/spark/pull/14431
That's a good point, @shivaram `worker.R` is the component which has the
keys and appends it to the output.
I don't see any elegant way of doing it in `worker.R` yet.
However, I was thinking about the following option:
We can still have optional flag in gapply that states if the key is
required or not but we will not pass it over to scala side.
By default we can always prepend keys in `worker.R` and in `group.R` we can
have a check such as:
if (!prependKey) {
// de-attach/remove the appended key columns.
}
Is this sound reasonable or is it a still hackish ?
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