Github user rdblue commented on a diff in the pull request:

    https://github.com/apache/spark/pull/20477#discussion_r165728696
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/v2/DataSourceV2ScanExec.scala
 ---
    @@ -36,11 +38,14 @@ import org.apache.spark.sql.types.StructType
      */
     case class DataSourceV2ScanExec(
         fullOutput: Seq[AttributeReference],
    -    @transient reader: DataSourceReader)
    +    @transient reader: DataSourceReader,
    +    @transient sourceClass: Class[_ <: DataSourceV2])
       extends LeafExecNode with DataSourceReaderHolder with ColumnarBatchScan {
     
       override def canEqual(other: Any): Boolean = 
other.isInstanceOf[DataSourceV2ScanExec]
     
    +  override def simpleString: String = s"Scan $metadataString"
    --- End diff --
    
    +1 for overriding nodeName.


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