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From "Vihang Karajgaonkar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-18421) Vectorized execution handles overflows in a different manner than non-vectorized execution
Date Sat, 03 Feb 2018 02:54:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-18421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16351216#comment-16351216
] 

Vihang Karajgaonkar commented on HIVE-18421:
--------------------------------------------

adding reviewboard link

> Vectorized execution handles overflows in a different manner than non-vectorized execution
> ------------------------------------------------------------------------------------------
>
>                 Key: HIVE-18421
>                 URL: https://issues.apache.org/jira/browse/HIVE-18421
>             Project: Hive
>          Issue Type: Bug
>          Components: Vectorization
>    Affects Versions: 2.1.1, 2.2.0, 3.0.0, 2.3.2
>            Reporter: Vihang Karajgaonkar
>            Assignee: Vihang Karajgaonkar
>            Priority: Major
>         Attachments: HIVE-18421.01.patch
>
>
> In vectorized execution arithmetic operations which cause integer overflows can give
wrong results. Issue is reproducible in both Orc and parquet.
> Simple test case to reproduce this issue
> {noformat}
> set hive.vectorized.execution.enabled=true;
> create table parquettable (t1 tinyint, t2 tinyint) stored as parquet;
> insert into parquettable values (-104, 25), (-112, 24), (54, 9);
> select t1, t2, (t1-t2) as diff from parquettable where (t1-t2) < 50 order by diff
desc;
> +-------+-----+-------+
> |  t1   | t2  | diff  |
> +-------+-----+-------+
> | -104  | 25  | 127   |
> | -112  | 24  | 120   |
> | 54    | 9   | 45    |
> +-------+-----+-------+
> {noformat}
> When vectorization is turned off the same query produces only one row.



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