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https://issues.apache.org/jira/browse/SPARK-37357?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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XiDuo You updated SPARK-37357:
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Summary: Create skew partition specs should respect min partition size
(was: Add merged last partition factor for rebalance)
> Create skew partition specs should respect min partition size
> -------------------------------------------------------------
>
> Key: SPARK-37357
> URL: https://issues.apache.org/jira/browse/SPARK-37357
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.3.0
> Reporter: XiDuo You
> Priority: Major
>
> `Rebalance` provide a functionality that split the large reduce partition
> into smalls. However we have seen many SQL produce small files due to the
> last partition.
> Let's say we have one reduce partition and six map partitions and the blocks
> are: [10, 10, 10, 10, 10, 10]. If the target size is 50, we will get two
> files with 50 and 10. And it will get worse if there are thousands of reduce
> partitions.
> It should be helpful if we can merge the last small partition into previous.
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