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From "Matt McCline (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12315) vectorization_short_regress.q has a wrong result issue for a double calculation
Date Tue, 03 Nov 2015 02:30:27 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14986539#comment-14986539
] 

Matt McCline commented on HIVE-12315:
-------------------------------------

Gopal suspects this might be related to the recent HIVE-10235 "Loop optimization for SIMD
in ColumnDivideColumn.txt (chengxiang, reviewed by Gopal V)" change.

> vectorization_short_regress.q has a wrong result issue for a double calculation
> -------------------------------------------------------------------------------
>
>                 Key: HIVE-12315
>                 URL: https://issues.apache.org/jira/browse/HIVE-12315
>             Project: Hive
>          Issue Type: Bug
>          Components: Vectorization
>            Reporter: Matt McCline
>            Assignee: Matt McCline
>            Priority: Critical
>         Attachments: vectorization_short_regress_bug.q
>
>
> I suspect it is related to the fancy optimizations in vectorized double divide that try
to quickly process the batch without checking each row for null.



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