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