Github user ctubbsii commented on a diff in the pull request:
    --- Diff: 
    @@ -162,6 +162,14 @@ private void readNext(boolean initialSeek) throws 
IOException {
       private boolean switchSource() throws IOException {
         if (!source.isCurrent()) {
           source = source.getNewDataSource();
    +      // if our source actually changed, then attempt to close the 
previous iterator
    +      try {
    +        if (iter != null) {
    +          iter.close();
    +        }
    +      } catch (Exception e) {
    +        throw new IOException(e);
    --- End diff --
    This is a private method. Do we need to wrap exceptions here, or should we 
handle it in the caller? It seems we might be converting them to IOExceptions 
here, only to have them converted back to RuntimeExceptions later.

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