Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/3531#issuecomment-65175014
I think it is too risky to do this this way right now. It seems to me the
main advantage of using coalesce is when you have a huge number of partitions
without a highly selective filter. Maybe we can have two variants of Limit, and
in the optimizer, we pick the coalesce one if there is no filter at all?
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