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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-11573) PointLookupOptimizer can be pessimistic at a low nDV
Date Wed, 19 Aug 2015 08:53:45 GMT

     [ https://issues.apache.org/jira/browse/HIVE-11573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gopal V updated HIVE-11573:
---------------------------
    Attachment:     (was: HIVE-11594.2.patch)

> 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
>
>         Attachments: HIVE-11573.1.patch
>
>
> 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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