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From "Ning Zhang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-1544) Filtering out NULL-keyed rows in ReduceSinkOperator when no outer join involved
Date Mon, 16 Aug 2010 21:20:21 GMT
Filtering out NULL-keyed rows in ReduceSinkOperator when no outer join involved
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                 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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