Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/8956#issuecomment-150900439
@rxin I am curious that although I don't observe significant performance
improvement from a simple projection + filter operation by now with simple
experiment, by making this filters pushed down to Parquet side, do we retrieve
less data and reduce the memory footprint? If so, even under the same
performance level, is this patch still worth merging?
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