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From "Ryan Blue (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-14305) To/From UTC timestamp may return incorrect result because of DST
Date Mon, 25 Jul 2016 21:33:21 GMT

    [ https://issues.apache.org/jira/browse/HIVE-14305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15392706#comment-15392706
] 

Ryan Blue commented on HIVE-14305:
----------------------------------

All time calculations should be carried out in UTC, by setting the default Timestamp zone
to UTC when Hive starts. After that, setDefault shouldn't be called. If this conflicts with
other Timestamp uses in the JVM, then Hive should change so that it doesn't use Timestamp.
Spark, for example, represents time internally as microseconds from epoch.

> 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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