gatorsmile commented on a change in pull request #23579: [SPARK-26659][SQL] Fix 
duplicate cmd.nodeName in the explain output of DataWritingCommandExec
URL: https://github.com/apache/spark/pull/23579#discussion_r248905368
 
 

 ##########
 File path: 
sql/core/src/main/scala/org/apache/spark/sql/execution/command/commands.scala
 ##########
 @@ -110,6 +110,9 @@ case class DataWritingCommandExec(cmd: DataWritingCommand, 
child: SparkPlan)
 
   override def nodeName: String = "Execute " + cmd.nodeName
 
+  // override the default one, otherwise the `cmd.nodeName` will appear twice 
from simpleString
+  override def argString(maxFields: Int): String = cmd.argString(maxFields)
 
 Review comment:
   you still need a test case in ExplainSuite

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