public static String makePartName(List<String> partCols, List<String> vals) {
    return makePartName(partCols, vals, null);
  }
Variant of Path.makeQualified that qualifies the input path against the default file system
indicated by the configuration

This does not require a FileSystem handle in most cases - only requires the Filesystem URI.
This saves the cost of opening the Filesystem - which can involve RPCs - as well as cause
errors

@param path
         path to be fully qualified
@param conf
         Configuration file
@return path qualified relative to default file system
common/src/java/org/apache/hadoop/hive/common/FileUtils.java