Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/20894#discussion_r188685864 --- 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), + actualSchema, csvDataset.getClass.getCanonicalName, checkHeaderFlag = true, --- End diff -- please make them consistent. rename it to `enforceSchema`
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