[
https://issues.apache.org/jira/browse/PHOENIX-5793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17140975#comment-17140975
]
chenglei commented on PHOENIX-5793:
-----------------------------------
[~fengchen8086], added more code to support semi/anti join and more unit tests
and IT testes.
> 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
> Affects Versions: 5.0.0
> Reporter: Chen Feng
> Assignee: Chen Feng
> Priority: Minor
> Fix For: 5.1.0
>
> Attachments: PHOENIX-5793-v2.patch, PHOENIX-5793-v3.patch,
> PHOENIX-5793-v4.patch, PHOENIX-5793-v5.patch, PHOENIX-5793_v1-4.x.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.
>
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
