public static void setInputSplitKeyPattern(final Configuration conf, final String pattern) {
   setJSON(conf, INPUT_SPLIT_KEY_PATTERN, pattern);
 }
 public static void setFields(final Configuration conf, final String fields) {
   setJSON(conf, INPUT_FIELDS, fields);
 }
 public static void setSort(final Configuration conf, final String sort) {
   setJSON(conf, INPUT_SORT, sort);
 }
 public static void setQuery(final Configuration conf, final String query) {
   setJSON(conf, INPUT_QUERY, query);
 }