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https://issues.apache.org/jira/browse/SPARK-25913?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16672057#comment-16672057
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Apache Spark commented on SPARK-25913:
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User 'MaxGekk' has created a pull request for this issue:
https://github.com/apache/spark/pull/22925

> Unary SparkPlan nodes should extend UnaryExecNode
> -------------------------------------------------
>
>                 Key: SPARK-25913
>                 URL: https://issues.apache.org/jira/browse/SPARK-25913
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.4.0
>            Reporter: Maxim Gekk
>            Priority: Minor
>
> The execution nodes with one child (unary node) should extend UnaryExecNode. 
> For example:
> * DataWritingCommandExec
> * EvalPythonExec
> * ContinuousCoalesceExec



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