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From "Chen Feng (Jira)" <j...@apache.org>
Subject [jira] [Updated] (PHOENIX-5793) Support parallel init and fast null return for SortMergeJoinPlan.
Date Tue, 14 Apr 2020 03:02:00 GMT

     [ https://issues.apache.org/jira/browse/PHOENIX-5793?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chen Feng updated PHOENIX-5793:
-------------------------------
    Attachment:     (was: PHOENIX-5793-v5.patch)

> 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, PHOENIX-5793-v3.patch, PHOENIX-5793-v4.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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