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From "Jinfeng Ni (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-3765) Partition prune rule is unnecessary fired multiple times.
Date Tue, 03 Nov 2015 18:07:27 GMT

    [ https://issues.apache.org/jira/browse/DRILL-3765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14987748#comment-14987748
] 

Jinfeng Ni commented on DRILL-3765:
-----------------------------------

Caching the result will help. But I feel it probably will not help a lot in case where intermediate
filters are pushed down, and partition rule is fired against the intermediate filters. Ideally,
we only want to apply the partition rule against the final filter. 
 

> Partition prune rule is unnecessary fired multiple times. 
> ----------------------------------------------------------
>
>                 Key: DRILL-3765
>                 URL: https://issues.apache.org/jira/browse/DRILL-3765
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Query Planning & Optimization
>            Reporter: Jinfeng Ni
>            Assignee: Jinfeng Ni
>
> It seems that the partition prune rule may be fired multiple times, even after the first
rule execution has pushed the filter into the scan operator. Since partition prune has to
build the vectors to contain the partition /file / directory information, to invoke the partition
prune rule unnecessary may lead to big memory overhead.
> Drill planner should avoid the un-necessary partition prune rule, in order to reduce
the chance of hitting OOM exception, while the partition prune rule is executed.



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