Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/5622#issuecomment-100558232
I'm going to close this pull request for now, since I think that we're
going to need to spend more time thinking through a more general strategy of
how to handle empty partitions / output files. In some local benchmarking, the
changes in this patch made a large difference for out-of-the-box single-machine
spark-shell SQL performance, but I think that we'll want to re-assess perf.
benchmarking for that workload after the other 1.4 improvements land.
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