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https://issues.apache.org/jira/browse/SPARK-35239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17333016#comment-17333016
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Apache Spark commented on SPARK-35239:
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User 'ulysses-you' has created a pull request for this issue:
https://github.com/apache/spark/pull/32362
> Coalesce shuffle partition should handle empty input RDD
> ---------------------------------------------------------
>
> Key: SPARK-35239
> URL: https://issues.apache.org/jira/browse/SPARK-35239
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: ulysses you
> Priority: Minor
>
> If input RDD partition is empty then the map output statistics will be null.
> And if all shuffle stage's input RDD partition is empty, we will skip it and
> lose the chance to coalesce partition.
>
> We can simply create a empty partition for these custom shuffle reader to
> reduce the partition number.
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