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Posted to issues@hive.apache.org by "Dhiraj Kumar (JIRA)" <ji...@apache.org> on 2017/02/15 18:45:41 UTC

[jira] [Assigned] (HIVE-15486) DefaultGraphWalker invokes getChildren() as many times as there are children

     [ https://issues.apache.org/jira/browse/HIVE-15486?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dhiraj Kumar reassigned HIVE-15486:
-----------------------------------

    Assignee: Dhiraj Kumar

> DefaultGraphWalker invokes getChildren() as many times as there are children
> ----------------------------------------------------------------------------
>
>                 Key: HIVE-15486
>                 URL: https://issues.apache.org/jira/browse/HIVE-15486
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 2.0.0, 2.1.0
>            Reporter: Dhiraj Kumar
>            Assignee: Dhiraj Kumar
>         Attachments: query
>
>
> DefaultGraphWalker while walking a Node, calls up getChildren method as many times as there are children. This leads a performance penalty where a node has too many direct children. 
> Attached is query file. Instruction to run
> 1. time hive -f query  
> Checkout the time on hive 1.2 version vs 2.1 version. 
> This change was introduced in [HIVE-11652|https://issues.apache.org/jira/browse/HIVE-11652]



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