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From "Jason Dere (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-16462) Vectorization: Enabling hybrid grace disables specialization of all reduce side joins
Date Mon, 17 Apr 2017 23:16:41 GMT

     [ https://issues.apache.org/jira/browse/HIVE-16462?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jason Dere updated HIVE-16462:
------------------------------
    Attachment: HIVE-16462.1.patch

> Vectorization: Enabling hybrid grace disables specialization of all reduce side joins
> -------------------------------------------------------------------------------------
>
>                 Key: HIVE-16462
>                 URL: https://issues.apache.org/jira/browse/HIVE-16462
>             Project: Hive
>          Issue Type: Bug
>          Components: Vectorization
>            Reporter: Jason Dere
>            Assignee: Jason Dere
>         Attachments: HIVE-16462.1.patch
>
>
> Observed by [~gopalv].
> Having grace hash join enabled prevents the specialized vector hash joins during the
vectorizer stage of query planning. However hive.llap.enable.grace.join.in.llap will later
disable grace hash join (LlapDecider runs after Vectorizer). If we can disable the grace hash
join before vectorization kicks in then we can still benefit from the specialized vector hash
joins.
> This can be special cased for the llap.execution.mode=only case.



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