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https://issues.apache.org/jira/browse/SPARK-32291?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yuming Wang updated SPARK-32291:
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Attachment: repartition.png
> COALESCE should not reduce the child parallelism if it is Join
> --------------------------------------------------------------
>
> Key: SPARK-32291
> URL: https://issues.apache.org/jira/browse/SPARK-32291
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: Yuming Wang
> Priority: Major
> Attachments: COALESCE.png, repartition.png
>
>
> How to reproduce this issue:
> {code:scala}
> spark.range(100).createTempView("t1")
> spark.range(200).createTempView("t2")
> spark.sql("set spark.sql.autoBroadcastJoinThreshold=0")
> spark.sql("select /*+ COALESCE(1) */ t1.* from t1 join t2 on (t1.id =
> t2.id)").show
> {code}
> The dag is:
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