Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/8592#issuecomment-140230655
@nburoojy This will work, but the performance will be pretty bad, and very
prone to GC.
I think to properly fix this, we might want to rewrite the query under the
hood to implement it using an operator that gives a list of items, instead of
an aggregate function.
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