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https://issues.apache.org/jira/browse/HIVE-12559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15034783#comment-15034783
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Laljo John Pullokkaran commented on HIVE-12559:
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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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