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https://issues.apache.org/jira/browse/SPARK-34899?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ulysses you updated SPARK-34899:
--------------------------------
    Description: The `CoalesceShufflePartitions` can not coalesce such case if 
the total shuffle partitions size of mappers are big enough. Then it's confused 
to use `CustomShuffleReaderExec` which marked as `coalesced` but has no affect 
with partition number.  (was: The `CoalesceShufflePartitions` can not coalesce 
such case if the total shuffle partitions of mappers are big enough. Then it's 
confused to use `CustomShuffleReaderExec` which marked as `coalesced` but has 
no affect with partition number.)

> Use origin plan if can not coalesce shuffle partition
> -----------------------------------------------------
>
>                 Key: SPARK-34899
>                 URL: https://issues.apache.org/jira/browse/SPARK-34899
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.2.0
>            Reporter: ulysses you
>            Priority: Minor
>
> The `CoalesceShufflePartitions` can not coalesce such case if the total 
> shuffle partitions size of mappers are big enough. Then it's confused to use 
> `CustomShuffleReaderExec` which marked as `coalesced` but has no affect with 
> partition number.



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