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Posted to issues@spark.apache.org by "ulysses you (Jira)" <ji...@apache.org> on 2019/11/15 08:02:00 UTC

[jira] [Created] (SPARK-29912) Pruning shuffle exchange when input and output both are one partition

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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