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Posted to dev@hive.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2015/10/06 02:02:26 UTC

[jira] [Created] (HIVE-12040) CBO: Use CBO, even for the 1 JOIN + GROUP BY case

Gopal V created HIVE-12040:
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             Summary: 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
             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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