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