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Posted to dev@hive.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2015/08/15 08:16:45 UTC

[jira] [Created] (HIVE-11573) PointLookupOptimizer can be pessimistic at a low nDV

Gopal V created HIVE-11573:
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             Summary: PointLookupOptimizer can be pessimistic at a low nDV
                 Key: HIVE-11573
                 URL: https://issues.apache.org/jira/browse/HIVE-11573
             Project: Hive
          Issue Type: Bug
    Affects Versions: 1.3.0, 2.0.0
            Reporter: Gopal V
            Assignee: Gopal V
             Fix For: 1.3.0, 2.0.0


The PointLookupOptimizer can turn off some of the optimizations due to its use of tuple IN() clauses.

Limit the application of the optimizer for very low nDV cases and extract the sub-clause as a pre-condition during runtime, to trigger the simple column predicate index lookups.



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