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Posted to dev@phoenix.apache.org by "Chen Feng (Jira)" <ji...@apache.org> on 2020/03/23 12:10:00 UTC

[jira] [Created] (PHOENIX-5793) Support parallel init and fast null return for SortMergeJoinPlan.

Chen Feng created PHOENIX-5793:
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             Summary: Support parallel init and fast null return for SortMergeJoinPlan.
                 Key: PHOENIX-5793
                 URL: https://issues.apache.org/jira/browse/PHOENIX-5793
             Project: Phoenix
          Issue Type: Improvement
            Reporter: Chen Feng
            Assignee: Chen Feng


For a join sql like A join B. The implementation of SortMergeJoinPlan currently inits the two iterators A and B one by one.

By initializing A and B in parallel, we can improve performance in two aspects.

1) By overlapping the time in initializing.

2) If one child query is null, the other child query can be canceled since the final result must be null.

 



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