Github user davies commented on the pull request:
https://github.com/apache/spark/pull/12095#issuecomment-205509692
Pipelined reading is a good idea to overlap opening and processing, will be
done in another PR. After that, this PR is still useful, thinking of lots of
tiny files (100ms to open, but 1ms to process), opening these files will be
majority of the time, we should not add thousands of tiny files into one
partition.
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