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https://issues.apache.org/jira/browse/HIVE-14305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15388912#comment-15388912
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Ryan Blue commented on HIVE-14305:
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My point is that calculations should be carried out in UTC, rather than some
zone that may not support certain times for DST. The other issue notes that we
would have to update functions that must be done with respect to the local
zone, but that's fairly simple. You just apply an offset after performing the
current calculation to adjust the result to local.
I'm not sure what you mean about Timestamp.toString. When is that used?
> To/From UTC timestamp may return incorrect result because of DST
> ----------------------------------------------------------------
>
> Key: HIVE-14305
> URL: https://issues.apache.org/jira/browse/HIVE-14305
> Project: Hive
> Issue Type: Sub-task
> Reporter: Rui Li
> Assignee: Rui Li
>
> If the machine's local timezone involves DST, the UDFs return incorrect
> results.
> For example:
> {code}
> select to_utc_timestamp('2005-04-03 02:01:00','UTC');
> {code}
> returns {{2005-04-03 03:01:00}}. Correct result should be {{2005-04-03
> 02:01:00}}.
> {code}
> select to_utc_timestamp('2005-04-03 10:01:00','Asia/Shanghai');
> {code}
> returns {{2005-04-03 03:01:00}}. Correct result should be {{2005-04-03
> 02:01:00}}.
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