Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/2841#issuecomment-61140219
I talked to some twitter people and they were pretty excited about the task
side metadata reading because with big datasets they were seeing lots of OOMs
before even starting the jobs. It could also be pretty good for S3 if we can
avoid doing so much work serially on the driver. That said, it seems like it
would make features like merging multiple unique schema's impossible and its
newer / less tested. So, we'll want to be able to configure this easily
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