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

    https://github.com/apache/spark/pull/20894#discussion_r188535925
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/DataFrameReader.scala ---
    @@ -497,6 +498,11 @@ class DataFrameReader private[sql](sparkSession: 
SparkSession) extends Logging {
           StructType(schema.filterNot(_.name == 
parsedOptions.columnNameOfCorruptRecord))
     
         val linesWithoutHeader: RDD[String] = maybeFirstLine.map { firstLine =>
    +      if (parsedOptions.enforceSchema == false) {
    +        CSVDataSource.checkHeader(firstLine, new 
CsvParser(parsedOptions.asParserSettings),
    --- End diff --
    
    The function `checkHeader` is also called in `readFile`. Is it possible 
that it is called twice?


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