Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/11312#issuecomment-189642299
I'm not sure if it was intended to work as a partitioning key. The
timestamp in the dir name does not necessarily reflect any timestamp in the
data; it's always wall-clock time with a loose connection to when the events
happened or arrived. I don't think it's supposed to be interpreted this way.
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