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https://issues.apache.org/jira/browse/SPARK-29912?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ulysses you updated SPARK-29912:
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Description:
It is meaningless to do `repartition(1)` or `coalesce(1)` when a child plan
just output one partition.
Now, we can not get the output numPartitions during logic plan, so this issue
pruning the operation in physical plan.
was:
It is meaningless to do `repartition(1)` or `coalesce(1)` when a plan child
just output one partition.
Now, we can not get the output numPartitions during logic plan, so this issue
pruning the operation in physical plan.
> Pruning shuffle exchange and coalesce when input and output both are one
> partition
> ----------------------------------------------------------------------------------
>
> Key: SPARK-29912
> URL: https://issues.apache.org/jira/browse/SPARK-29912
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: ulysses you
> Priority: Minor
>
> It is meaningless to do `repartition(1)` or `coalesce(1)` when a child plan
> just output one partition.
> Now, we can not get the output numPartitions during logic plan, so this issue
> pruning the operation in physical plan.
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