Details
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Improvement
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Status: Open
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Major
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Resolution: Unresolved
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Description
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.
Attachments
Issue Links
- is related to
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HIVE-741 NULL is not handled correctly in join
- Closed