@Override
    public List<Object> first() throws HiveException {
      index = 0;
      if (array.length > 0) {
        return new ReadOnlySubList(0, rowLength);
      }
      return null;
    }
Row iterator for non-zero-length rows.
ql/src/java/org/apache/hadoop/hive/ql/exec/persistence/FlatRowContainer.java