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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