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https://issues.apache.org/jira/browse/HIVE-11569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14700778#comment-14700778
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Jesus Camacho Rodriguez commented on HIVE-11569:
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+1
> Use PreOrderOnceWalker where feasible
> -------------------------------------
>
> Key: HIVE-11569
> URL: https://issues.apache.org/jira/browse/HIVE-11569
> Project: Hive
> Issue Type: Improvement
> Components: Logical Optimizer
> Reporter: Ashutosh Chauhan
> Assignee: Ashutosh Chauhan
> Attachments: HIVE-11569.patch, HIVE-11569.patch
>
>
> Because of its early exit criteria it has better performance than
> {{PreOrderWalker}}
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