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https://issues.apache.org/jira/browse/SPARK-40050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17580660#comment-17580660
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Apache Spark commented on SPARK-40050:
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User 'wangyum' has created a pull request for this issue:
https://github.com/apache/spark/pull/37519
> Eliminate sort if parent is local limit
> ---------------------------------------
>
> Key: SPARK-40050
> URL: https://issues.apache.org/jira/browse/SPARK-40050
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.4.0
> Reporter: Yuming Wang
> Priority: Major
>
> It seems we can remove Sort operator:
> {code:scala}
> val projectPlan = testRelation.select($"a", $"b")
> val unnecessaryOrderByPlan = projectPlan.orderBy($"a".asc)
> val localLimitPlan = LocalLimit(Literal(2), unnecessaryOrderByPlan)
> val projectPlanB = testRelationB.select($"d")
> val joinPlan = localLimitPlan.join(projectPlanB, RightOuter).select($"a",
> $"d")
> {code}
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