Github user davies commented on the pull request:
https://github.com/apache/spark/pull/8400#issuecomment-134674552
The result you posted for Spark is totally wrong (you can't get the
timestamp back after one round trip), fortunately this is a fake alarm :)
For the Hive one, it bad but not wrong (different rounding method, you can
still read the timestamp back).
In general, maybe using Julian day here is the root of bad things, use
signed integer for number of days since epoch should be enough (could be
negative).
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