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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