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

    https://github.com/apache/spark/pull/5447#discussion_r28315739
  
    --- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala ---
    @@ -1659,9 +1659,14 @@ private[spark] object Utils extends Logging {
       val windowsDrive = "([a-zA-Z])".r
     
       /**
    -   * Format a Windows path such that it can be safely passed to a URI.
    +   * Format a path such that it can be safely passed to a URI.
        */
    -  def formatWindowsPath(path: String): String = path.replace("\\", "/")
    +  def formatPath(path: String, windows: Boolean): String = {
    +    val formatted = path.replace(" ", "%20")
    --- End diff --
    
    @steveloughran I think the issue is that we don't start with a `File` but 
with a `String` that may not be a `file:` URI. @tsudukim fragment is the bit 
after `#` in a URI, such as in `file:/foo/bar#baz` There's no fragment in your 
example and I would never expect to support such a thing. In fact I was a 
little surprised that this constructor handled the scheme in a scheme-specific 
part, but it seems to:
    
    ```
    scala> val uri = new java.net.URI(null, "hdfs:/foo/b ar#baz", null)
    uri: java.net.URI = hdfs:/foo/b%20ar%23baz
    
    scala> uri.toString
    res12: String = hdfs:/foo/b%20ar%23baz
    
    scala> uri.getScheme
    res13: String = hdfs
    
    scala> uri.getPath
    res14: String = /foo/b ar#baz
    
    scala> uri.getFragment
    res15: String = null
    ```
    
    This still seems like the way to go as far as I can tell.


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