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https://issues.apache.org/jira/browse/SPARK-33531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17238257#comment-17238257
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Apache Spark commented on SPARK-33531:
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User 'hammertank' has created a pull request for this issue:
https://github.com/apache/spark/pull/30489
> [SQL] Avoid shuffle when calling CollectLimitExec#executeToIterator
> -------------------------------------------------------------------
>
> Key: SPARK-33531
> URL: https://issues.apache.org/jira/browse/SPARK-33531
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.4.0, 3.0.1
> Reporter: Mori[A]rty
> Priority: Major
>
> CollectLimitExec#executeToIterator should be implemented using
> CollectLimitExec#executeCollect to avoid shuffle caused by invoking parent
> method SparkPlan#executeToIterator.
> When running a SparkThriftServer and
> spark.sql.thriftServer.incrementalCollect is enabled, this will lead to a
> significant performance issue for SQLs terminated with LIMIT.
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