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https://issues.apache.org/jira/browse/SPARK-35908?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yuming Wang resolved SPARK-35908.
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Resolution: Not A Problem
> Remove repartition if the child maximum number of rows less than or equal to 1
> ------------------------------------------------------------------------------
>
> Key: SPARK-35908
> URL: https://issues.apache.org/jira/browse/SPARK-35908
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: Yuming Wang
> Priority: Major
>
> {code:scala}
> spark.sql("select count(*) from range(1, 10, 2,
> 2)").repartition(10).explain("cost")
> {code}
> Current optimized logical plan:
> {noformat}
> == Optimized Logical Plan ==
> Repartition 10, true, Statistics(sizeInBytes=16.0 B, rowCount=1)
> +- Aggregate [count(1) AS count(1)#2L], Statistics(sizeInBytes=16.0 B,
> rowCount=1)
> +- Project, Statistics(sizeInBytes=20.0 B)
> +- Range (1, 10, step=2, splits=Some(2)), Statistics(sizeInBytes=40.0
> B, rowCount=5)
> {noformat}
> Expected optimized logical plan:
> {noformat}
> == Optimized Logical Plan ==
> Aggregate [count(1) AS count(1)#2L], Statistics(sizeInBytes=16.0 B,
> rowCount=1)
> +- Project, Statistics(sizeInBytes=20.0 B)
> +- Range (1, 10, step=2, splits=Some(2)), Statistics(sizeInBytes=40.0 B,
> rowCount=5)
> {noformat}
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