Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/17623#discussion_r112703773
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeExtractors.scala
 ---
    @@ -111,6 +111,11 @@ case class GetStructField(child: Expression, ordinal: 
Int, name: Option[String]
       override def dataType: DataType = childSchema(ordinal).dataType
       override def nullable: Boolean = child.nullable || 
childSchema(ordinal).nullable
     
    +  override def verboseString: String = {
    --- End diff --
    
    so `verboseString` must use function-style format like `func(x1, x2)`?


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