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

    https://github.com/apache/spark/pull/18581#discussion_r126453938
  
    --- Diff: 
mllib/src/main/scala/org/apache/spark/ml/source/libsvm/LibSVMOptions.scala ---
    @@ -41,11 +41,15 @@ private[libsvm] class LibSVMOptions(@transient private 
val parameters: CaseInsen
         case o => throw new IllegalArgumentException(s"Invalid value `$o` for 
parameter " +
           s"`$VECTOR_TYPE`. Expected types are `sparse` and `dense`.")
       }
    +
    +  val lineSeparator: Option[String] = parameters.get(LINE_SEPARATOR)
    --- End diff --
    
    Yea, actually in case of Univocity, it requires 2 characters:
    
    ```
    CsvWriterSettings settings = new CsvWriterSettings();
    settings.getFormat().setLineSeparator("aaa");
    ```
    
    ```
    Exception in thread "main" java.lang.IllegalArgumentException: Invalid line 
separator. Up to 2 characters are expected. Got 3 characters.
        at com.univocity.parsers.common.Format.setLineSeparator(Format.java:121)
        at com.univocity.parsers.common.Format.setLineSeparator(Format.java:109)
    ```
    
    I don't see a reason to restrict this for now. At least, I can provide an 
usecase with Windows -`\r\n`.


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