public static TableDescriptorDelta computeDelta(TableDescriptor oldTD, TableDescriptor newTD) {
    return new TableDescriptorDelta(oldTD, newTD);
  }
Compares two {@link TableDescriptor} and indicate which columns were added, deleted, or
modified from oldTD to newTD
@return a TableDescriptorDelta that contains the added/deleted/modified column names
hbase-client/src/main/java/org/apache/hadoop/hbase/client/TableDescriptorUtils.java