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

    https://github.com/apache/spark/pull/20545#discussion_r167762799
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/types/StructType.scala ---
    @@ -104,6 +104,13 @@ case class StructType(fields: Array[StructField]) 
extends DataType with Seq[Stru
       /** Returns all field names in an array. */
       def fieldNames: Array[String] = fields.map(_.name)
     
    +  /**
    +   * Returns all field names in an array. This is an alias of `fieldNames`.
    +   *
    +   * @since 2.3.0
    --- End diff --
    
    This is too late to be merged to 2.3.0. Please change it to 2.4.0. 


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