Github user clockfly commented on a diff in the pull request: https://github.com/apache/spark/pull/15024#discussion_r78472224 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSource.scala --- @@ -435,13 +435,13 @@ case class DataSource( // 1. Only one output path can be specified on the write path; // 2. Output path must be a legal HDFS style file system path; // 3. It's OK that the output path doesn't exist yet; - val caseInsensitiveOptions = new CaseInsensitiveMap(options) - val outputPath = { - val path = new Path(caseInsensitiveOptions.getOrElse("path", { - throw new IllegalArgumentException("'path' is not specified") - })) + val allPaths = paths ++ new CaseInsensitiveMap(options).get("path") + val outputPath = if (allPaths.length == 1) { + val path = new Path(allPaths.head) val fs = path.getFileSystem(sparkSession.sessionState.newHadoopConf()) path.makeQualified(fs.getUri, fs.getWorkingDirectory) + } else { + throw new IllegalArgumentException("Only one path can be specified on the write path") --- End diff -- Is IllegalArgumentException a proper message type? It is a RuntimeException used when calling a method with reflection but passing different argument type. ``` /** * Thrown to indicate that a method has been passed an illegal or * inappropriate argument. * * @author unascribed * @since JDK1.0 */ ```
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