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https://issues.apache.org/jira/browse/PHOENIX-5793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17064806#comment-17064806
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chenglei commented on PHOENIX-5793:
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[~fengchen8086]， I think there is no need to introduce a new option, this
optimze is always better.
> 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
> Priority: Minor
> Attachments: PHOENIX-5793-v2.patch
>
>
> 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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