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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-1544) Filtering out NULL-keyed rows in ReduceSinkOperator when no outer join involved
Date Wed, 18 Aug 2010 09:44:16 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1544?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12899805#action_12899805
] 

Amareshwari Sriramadasu commented on HIVE-1544:
-----------------------------------------------

Also,see Namit's [comment|https://issues.apache.org/jira/browse/HIVE-741?focusedCommentId=12899177&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12899177]
on HIVE-741

> Filtering out NULL-keyed rows in ReduceSinkOperator when no outer join involved
> -------------------------------------------------------------------------------
>
>                 Key: HIVE-1544
>                 URL: https://issues.apache.org/jira/browse/HIVE-1544
>             Project: Hadoop Hive
>          Issue Type: Improvement
>            Reporter: Ning Zhang
>
> As discussed in HIVE-741, if a plan indicates that a non-outer join is the first operator
in the reducer, the ReduceSinkOperator should filter out (not sending) rows with NULL as keys
since they will not generate any results anyways. This should save both bandwidth and processing
power. 

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