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https://issues.apache.org/jira/browse/SPARK-32083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17148584#comment-17148584
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Apache Spark commented on SPARK-32083:
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User 'manuzhang' has created a pull request for this issue:
https://github.com/apache/spark/pull/28954
> Unnecessary tasks are launched when input is empty with AQE
> -----------------------------------------------------------
>
> Key: SPARK-32083
> URL: https://issues.apache.org/jira/browse/SPARK-32083
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Manu Zhang
> Priority: Minor
>
> [https://github.com/apache/spark/pull/28226] meant to avoid launching
> unnecessary tasks for 0-size partitions when AQE is enabled. However, when
> all partitions are empty, the number of partitions will be
> `spark.sql.adaptive.coalescePartitions.initialPartitionNum` and (a lot of)
> unnecessary tasks are launched in this case.
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