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From "Laljo John Pullokkaran (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-12559) Vectorization on MR produces different results
Date Tue, 01 Dec 2015 21:44:11 GMT
Laljo John Pullokkaran created HIVE-12559:
---------------------------------------------

             Summary: 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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