GitHub user davies opened a pull request:
https://github.com/apache/spark/pull/13784
[SPARK-16078] [SQL] from_utc_timestamp/to_utc_timestamp should not depends
on local timezone
## What changes were proposed in this pull request?
Currently, we use local timezone to parse or format a timestamp
(TimestampType), then use Long as the microseconds since epoch UTC.
In from_utc_timestamp() and to_utc_timestamp(), we did not consider the
local timezone, they could return different results with different local
timezone.
This PR will do the conversion based on human time (in local timezone), it
should return same result in whatever timezone. But because the mapping from
absolute timestamp to human time is not exactly one-to-one mapping, it will
still return wrong result in some timezone (also in the begging or ending of
DST).
This PR is kind of the best effort fix. In long term, we should make the
TimestampType be timezone aware to fix this totally.
## How was this patch tested?
Tested these function in all timezone.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davies/spark convert_tz
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13784.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #13784
----
commit 5c60bc6321bda90c85a26180c38be5744d68cc55
Author: Davies Liu <[email protected]>
Date: 2016-06-20T19:48:35Z
fix fromUTCTime/toUTCTime
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