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From "Gunther Hagleitner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-8746) ORC timestamp columns are sensitive to daylight savings time
Date Mon, 23 Mar 2015 23:30:53 GMT

    [ https://issues.apache.org/jira/browse/HIVE-8746?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14376904#comment-14376904
] 

Gunther Hagleitner commented on HIVE-8746:
------------------------------------------

LGTM +1

> ORC timestamp columns are sensitive to daylight savings time
> ------------------------------------------------------------
>
>                 Key: HIVE-8746
>                 URL: https://issues.apache.org/jira/browse/HIVE-8746
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 0.11.0, 0.12.0, 0.13.0, 0.14.0, 1.0.0, 1.2.0, 1.1.0
>            Reporter: Owen O'Malley
>            Assignee: Prasanth Jayachandran
>         Attachments: HIVE-8746.1.patch, HIVE-8746.2.patch, HIVE-8746.3.patch, HIVE-8746.4.patch
>
>
> Hive uses Java's Timestamp class to manipulate timestamp columns. Unfortunately the textual
parsing in Timestamp is done in local time and the internal storage is in UTC.
> ORC mostly side steps this issue by storing the difference between the time and a base
time also in local and storing that difference in the file. Reading the file between timezones
will mostly work correctly "2014-01-01 12:34:56" will read correctly in every timezone.
> However, when moving between timezones with different daylight saving it creates trouble.
In particular, moving from a computer in PST to UTC will read "2014-06-06 12:34:56" as "2014-06-06
11:34:56".



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