Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/11806#issuecomment-198314857
It does mean each record is compressed separately. Maybe that makes sense
for huge records, or somehow facilitates processing pieces of a block (since
the whole block has to be uncompressed to use any of it). However Tom's book
says block compression should be preferred. I don't know why it's not the
default. Also summoning @steveloughran
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