ulysses you created SPARK-29912:
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Summary: Pruning shuffle exchange 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
It is meaningless to do `repartition(1)` or `coalesce(1)` when a plan child
just have one partition.
Now, we can not get the output numPartitions during logic plan, so the issue
pruning the operation in physical plan.
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