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https://issues.apache.org/jira/browse/HIVE-3671?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yin Huai resolved HIVE-3671.
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Resolution: Not A Problem
Right now, Correlation Optimizer will try to figure out if a JoinOperator will
be converted to MapJoin later in the physical optimization phase (by
CommonJoinResolver). Generally, we should consider this jira as "Not A
Problem". If we want to do any improvement or bug fix on this part, we can open
a new jira and describe the specific improvement/issue in there.
I am closing it.
> If a query has been optimized by correlation optimizer, join auto convert
> cannot optimize it
> --------------------------------------------------------------------------------------------
>
> Key: HIVE-3671
> URL: https://issues.apache.org/jira/browse/HIVE-3671
> Project: Hive
> Issue Type: Sub-task
> Components: Query Processor
> Reporter: Yin Huai
> Assignee: Yin Huai
>
> Currently, if a query has been optimized by correlation optimizer, the first
> operator at the reduce side will be CorrelationReducerDispatchOperator. Since
> CommonJoinResolver will only work if the first operator at the reduce side is
> a join operator, join auto convert cannot optimize this query. This jira is
> used to discuss how to make correlation optimizer compatible with join auto
> convert.
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