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From "Harish Butani (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-7304) Transitive Predicate Propagation doesn't happen properly after HIVE-7159
Date Tue, 01 Jul 2014 03:52:24 GMT

    [ https://issues.apache.org/jira/browse/HIVE-7304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14048475#comment-14048475
] 

Harish Butani commented on HIVE-7304:
-------------------------------------

[~ashutoshc] yes i would prefer committing this one. 
Also  [~gopalv] pointed out that in the above e.g. 'key is not null' is useful(performance
wise) because the Storage Handler predicate evaluation of  'key < 100' doesn't filter out
null valued columns. 

> Transitive Predicate Propagation doesn't happen properly after HIVE-7159
> ------------------------------------------------------------------------
>
>                 Key: HIVE-7304
>                 URL: https://issues.apache.org/jira/browse/HIVE-7304
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Processor
>            Reporter: Harish Butani
>            Assignee: Harish Butani
>         Attachments: HIVE-7304.1.patch, HIVE-7304.2.patch
>
>
> The reason for the regression is that PredicateTransitivePropagate looks at the FilterOperator
below the ReduceSink. 
> SemanticAnalyzer::genNotNullFilterForJoinSourcePlan was stacking another FilterOp for
the not null check, so only that predicate was being applied transitively by PredicateTransitivePropagate.



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