public void copyFrom(Result other) {
    checkReadonly();
    this.row = null;
    this.familyMap = null;
    this.cells = other.cells;
  }
Copy another Result into this one. Needed for the old Mapred framework
@throws UnsupportedOperationException if invoked on instance of EMPTY_RESULT (which is supposed
                                      to be immutable).
hbase-client/src/main/java/org/apache/hadoop/hbase/client/Result.java