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From "Laljo John Pullokkaran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12559) Vectorization on MR produces different results
Date Tue, 01 Dec 2015 22:47:10 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15034783#comment-15034783
] 

Laljo John Pullokkaran commented on HIVE-12559:
-----------------------------------------------

https://docs.oracle.com/cd/E19957-01/806-3568/ncg_math.html

> Vectorization on MR produces different results
> ----------------------------------------------
>
>                 Key: HIVE-12559
>                 URL: https://issues.apache.org/jira/browse/HIVE-12559
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Laljo John Pullokkaran
>            Assignee: Matt McCline
>
> Vectorization on MR produces different results for semantically equivalent queries.
> SET hive.vectorized.execution.enabled=true;
> SET hive.auto.convert.join=true;
> SET hive.auto.convert.join.noconditionaltask=true;
> SET hive.auto.convert.join.noconditionaltask.size=1000000000;
> SET hive.cbo.enable=false;
> select sum(v1.cdouble) from alltypesorc v3 join alltypesorc v1 on v1.csmallint=v3.csmallint
join alltypesorc v2 on v1.ctinyint=v2.ctinyint;
> -- Produces 6.065190932488167E11
> select sum(v1.cdouble) from alltypesorc v1 join alltypesorc v2 on v1.ctinyint=v2.ctinyint
join alltypesorc v3 on v1.csmallint=v3.csmallint;
> -- Produces 6.065190932486892E11



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