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https://issues.apache.org/jira/browse/SPARK-32083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17334443#comment-17334443
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Manu Zhang commented on SPARK-32083:
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This issue has been fixed in https://issues.apache.org/jira/browse/SPARK-35239
> 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
> Assignee: Wenchen Fan
> Priority: Minor
> Fix For: 3.0.1, 3.1.0
>
>
> [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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