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https://issues.apache.org/jira/browse/HIVE-11573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14706734#comment-14706734
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Jesus Camacho Rodriguez commented on HIVE-11573:
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+1 pending QA run.
> 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
> Labels: TODOC2.0
> Fix For: 1.3.0, 2.0.0
>
> Attachments: HIVE-11573.1.patch, HIVE-11573.2.patch,
> HIVE-11573.3.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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