[jira] [Created] (HIVE-16462) Vectorization: Enabling hybrid grace disables specialization of all reduce side joins

["Jason Dere (JIRA)" <ji...@apache.org>]

Jason Dere created HIVE-16462:
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             Summary: 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


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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