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From "Brock Noland (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-4845) Correctness issue with MapJoins using the null safe operator
Date Fri, 12 Jul 2013 19:07:48 GMT

     [ https://issues.apache.org/jira/browse/HIVE-4845?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Brock Noland updated HIVE-4845:
-------------------------------

    Description: 
I found a correctness issue while working on HIVE-4838. The following query from join_nullsafe.q
gives different results depending on if it's executed map-side or reduce-side:

{noformat}
SELECT /*+ MAPJOIN(a) */ * FROM smb_input1 a JOIN smb_input1 b ON a.key <=> b.key AND
a.value <=> b.value ORDER BY a.key, a.value, b.key, b.value;
{noformat}

For that query rows which should be joined are not. 


  was:
I found a correctness issue while working on HIVE-4838. The following query from join_nullsafe.q
gives different results depending on if it's executed map-side or reduce-side:

{noformat}
SELECT /*+ MAPJOIN(a) */ * FROM smb_input1 a JOIN smb_input1 b ON a.key <=> b.key AND
a.value <=> b.value ORDER BY a.key, a.value, b.key, b.value;
{noformat}


    
> Correctness issue with MapJoins using the null safe operator
> ------------------------------------------------------------
>
>                 Key: HIVE-4845
>                 URL: https://issues.apache.org/jira/browse/HIVE-4845
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Brock Noland
>            Assignee: Brock Noland
>            Priority: Critical
>         Attachments: HIVE-4845.patch
>
>
> I found a correctness issue while working on HIVE-4838. The following query from join_nullsafe.q
gives different results depending on if it's executed map-side or reduce-side:
> {noformat}
> SELECT /*+ MAPJOIN(a) */ * FROM smb_input1 a JOIN smb_input1 b ON a.key <=> b.key
AND a.value <=> b.value ORDER BY a.key, a.value, b.key, b.value;
> {noformat}
> For that query rows which should be joined are not. 

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