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Posted to issues@drill.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2018/08/02 17:17:02 UTC
[jira] [Commented] (DRILL-6645) Transform TopN in Lateral Unnest
pipeline to Sort and Limit.
[ https://issues.apache.org/jira/browse/DRILL-6645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16567106#comment-16567106 ]
ASF GitHub Bot commented on DRILL-6645:
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HanumathRao opened a new pull request #1417: DRILL-6645: Transform TopN in Lateral Unnest pipeline to Sort and Limit.
URL: https://github.com/apache/drill/pull/1417
In Lateral/Unnest pipeline, for the sake of getting correct results it is required to introduce a ParitionLimit instead of Limit. ParitionLimit is introduced by PR for DRILL-6652. Similarly a TopN should have another version like PartitionTopN. Since ParitionTopN operator is not yet implemented we can use Limit and sort to replace a TopN. This PR includes changes to transform the TopN -> Sort and Limit.
@gparai @sohami Can you please review these changes.
This PR needs to be committed after the DRILL-6652 committed.
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> Transform TopN in Lateral Unnest pipeline to Sort and Limit.
> ------------------------------------------------------------
>
> Key: DRILL-6645
> URL: https://issues.apache.org/jira/browse/DRILL-6645
> Project: Apache Drill
> Issue Type: Improvement
> Components: Query Planning & Optimization
> Affects Versions: 1.14.0
> Reporter: Hanumath Rao Maduri
> Assignee: Hanumath Rao Maduri
> Priority: Major
> Fix For: 1.15.0
>
>
> TopN operator is not supported in Lateral Unnest pipeline. Hence transform the TopN to use Sort and Limit.
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