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From "Prasanth Jayachandran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-11031) ORC concatenation of old files can fail while merging column statistics
Date Thu, 18 Jun 2015 17:24:01 GMT

    [ https://issues.apache.org/jira/browse/HIVE-11031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14592140#comment-14592140
] 

Prasanth Jayachandran commented on HIVE-11031:
----------------------------------------------

Note for backport: The branch-1.0 patch will apply cleanly, but if we run orc_merge_incompat1.q
it can fail on some platforms. To make it more consistent we need HIVE-8801 patch which makes
the orc_merge_incompat1.q test more consistent across platforms.

> ORC concatenation of old files can fail while merging column statistics
> -----------------------------------------------------------------------
>
>                 Key: HIVE-11031
>                 URL: https://issues.apache.org/jira/browse/HIVE-11031
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 0.13.0, 0.14.0, 1.0.0, 1.2.0, 1.1.0, 2.0.0
>            Reporter: Prasanth Jayachandran
>            Assignee: Prasanth Jayachandran
>            Priority: Critical
>             Fix For: 1.2.1, 2.0.0
>
>         Attachments: HIVE-11031-branch-1.0.patch, HIVE-11031.2.patch, HIVE-11031.3.patch,
HIVE-11031.4.patch, HIVE-11031.patch
>
>
> Column statistics in ORC are optional protobuf fields. Old ORC files might not have statistics
for newly added types like decimal, date, timestamp etc. But column statistics merging assumes
column statistics exists for these types and invokes merge. For example, merging of TimestampColumnStatistics
directly casts the received ColumnStatistics object without doing instanceof check. If the
ORC file contains time stamp column statistics then this will work else it will throw ClassCastException.
> Also, the file merge operator swallows the exception.



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