[jira] [Commented] (HIVE-17399) Do not remove semijoin branch if it feeds to TS->DPP_EVENT

["Gopal V (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-17399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16146537#comment-16146537 ] 

Gopal V commented on HIVE-17399:
--------------------------------

[~djaiswal]: left some comments - I like this approach of marking branches as dead and removing it later instead of hitting the concurrent exceptions, but want to make sure we don't have un-dead branches because mutable state is hard to debug without a state machine.

> Do not remove semijoin branch if it feeds to TS->DPP_EVENT
> ----------------------------------------------------------
>
>                 Key: HIVE-17399
>                 URL: https://issues.apache.org/jira/browse/HIVE-17399
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Deepak Jaiswal
>            Assignee: Deepak Jaiswal
>         Attachments: HIVE-17399.1.patch
>
>
> If there is an incoming semijoin branch to a TS which has DPP event, then try to keep it as it may serve as an excellent filter for DPP thus reducing the input to join drastically.



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