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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-11573) PointLookupOptimizer can be pessimistic at a low nDV
Date Wed, 13 Jan 2016 10:01:39 GMT

    [ https://issues.apache.org/jira/browse/HIVE-11573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15095915#comment-15095915
] 

Lefty Leverenz commented on HIVE-11573:
---------------------------------------

[~asears] documented *hive.optimize.point.lookup* in the wiki so I'm removing the TODOC2.0
label.  (*hive.optimize.point.lookup.extract* does not need to be documented because HIVE-11634
removed it.)  Thanks, Andrew.

* [Configuration Properties -- hive.optimize.point.lookup.min | https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.optimize.point.lookup.min]

> 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: 2.0.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>             Fix For: 2.0.0
>
>         Attachments: HIVE-11573.1.patch, HIVE-11573.2.patch, HIVE-11573.3.patch, HIVE-11573.4.patch,
HIVE-11573.5.patch, HIVE-11573.6.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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