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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