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

    https://github.com/apache/spark/pull/16089#discussion_r90575547
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/CSVRelation.scala
 ---
    @@ -245,24 +230,12 @@ private[csv] class CsvOutputWriter(
       override def write(row: Row): Unit = throw new 
UnsupportedOperationException("call writeInternal")
     
       override protected[sql] def writeInternal(row: InternalRow): Unit = {
    -    csvWriter.writeRow(rowToString(row), records == 0L && 
params.headerFlag)
    -    records += 1
    -    if (records % FLUSH_BATCH_SIZE == 0) {
    -      flush()
    -    }
    -  }
    -
    -  private def flush(): Unit = {
    -    val lines = csvWriter.flush()
    -    if (lines.nonEmpty) {
    -      text.set(lines)
    -      recordWriter.write(NullWritable.get(), text)
    -    }
    +    csvWriter.writeRow(rowToString(row), printHeader)
    --- End diff --
    
    Yup I asked this question but never had time to follow-up: 
https://github.com/uniVocity/univocity-parsers/issues/99
    



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