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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