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https://issues.apache.org/jira/browse/HIVE-12040?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gopal V resolved HIVE-12040.
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Resolution: Duplicate
> CBO: Use CBO, even for the 1 JOIN + GROUP BY case
> -------------------------------------------------
>
> Key: HIVE-12040
> URL: https://issues.apache.org/jira/browse/HIVE-12040
> Project: Hive
> Issue Type: Improvement
> Components: Logical Optimizer
> Affects Versions: 1.3.0, 2.0.0
> Reporter: Gopal V
> Assignee: Gopal V
> Fix For: 1.3.0, 2.0.0
>
>
> Hive CBO kicks in for a query only if a query has >1 joins, which is an
> archaic result of only re-ordering joins in the original impl.
> As more group-by & filter optimizers have been added, modify the CBO impl to
> kick in even if the query has a single JOIN.
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