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

    https://github.com/apache/spark/pull/20894#discussion_r188539966
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/CSVDataSource.scala
 ---
    @@ -118,16 +122,62 @@ object CSVDataSource {
           TextInputCSVDataSource
         }
       }
    +
    +  def checkHeaderColumnNames(schema: StructType, columnNames: 
Array[String], fileName: String,
    --- End diff --
    
    doc and style


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