public static Path[] getPaths(List<ParsedDelta> deltas) {
    Path[] result = new Path[deltas.size()];
    for(int i=0; i < result.length; ++i) {
      result[i] = deltas.get(i).getPath();
    }
    return result;
  }
Convert a list of deltas to a list of delta directories.
@param deltas the list of deltas out of a Directory object.
@return a list of delta directory paths that need to be read
ql/src/java/org/apache/hadoop/hive/ql/io/AcidUtils.java