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https://issues.apache.org/jira/browse/SPARK-35923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17371038#comment-17371038
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Apache Spark commented on SPARK-35923:
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User 'ulysses-you' has created a pull request for this issue:
https://github.com/apache/spark/pull/33123
> Coalesce empty partition with mixed CoalescedPartitionSpec and
> PartialReducerPartitionSpec
> ------------------------------------------------------------------------------------------
>
> Key: SPARK-35923
> URL: https://issues.apache.org/jira/browse/SPARK-35923
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: XiDuo You
> Priority: Major
>
> Since [SPARK-35447](https://issues.apache.org/jira/browse/SPARK-35447), we
> apply `OptimizeSkewedJoin` before `CoalesceShufflePartitions`. However, There
> are something different with the order of these two rules.
> Let's say if we have a skewed partitions: [0, 128MB, 0, 128MB, 0]:
> # coalesce partitions first then optimize skewed partitions:
> [64MB, 64MB, 64MB, 64MB]
> # optimize skew partition first then coalesce partitions:
> [0, 64MB, 64MB, 0, 64MB, 64MB, 0]
> So we can do coalesce in ShufflePartitionsUtil.coalescePartitionsWithSkew
> with mixed CoalescedPartitionSpec and PartialReducerPartitionSpec if
> CoalescedPartitionSpec is empty.
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