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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