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

    https://github.com/apache/spark/pull/18581#discussion_r134889031
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/HadoopFileLinesReader.scala
 ---
    @@ -32,7 +32,9 @@ import 
org.apache.hadoop.mapreduce.task.TaskAttemptContextImpl
      * in that file.
      */
     class HadoopFileLinesReader(
    -    file: PartitionedFile, conf: Configuration) extends Iterator[Text] 
with Closeable {
    +    file: PartitionedFile,
    +    lineSeparator: Option[String],
    --- End diff --
    
    Could you elaborate why? `LineRecordReader` without this works differently, 
covering newline variants by default. I don't know which string I should give 
for `LineRecordReader` constructor if this is not optional.


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