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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