Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/10342#issuecomment-165363732
I think the main thing this is giving up is that previously we could use
file channel's transferTo to copy data directly, but only when the compression
blocks can be just concatenated at the byte level. Without that property, we'd
have to read them (decompress) and then write them out again.
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