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https://issues.apache.org/jira/browse/HIVE-16462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15973240#comment-15973240
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Gopal V commented on HIVE-16462:
--------------------------------
+1
For reference, the crucial statement in the .q.out is
{{Fast Hash Table and No Hybrid Hash Join IS true}}
> 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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