Yuming Wang created SPARK-32291:
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Summary: 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
Attachments: COALESCE.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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