@Override
  public Scan addColumn(byte[] family, byte[] qualifier) {
    throw new UnsupportedOperationException("ImmutableScan does not allow access to addColumn");
  }
Create Immutable instance of Scan from given Scan object
@param scan Copy all values from Scan
hbase-client/src/main/java/org/apache/hadoop/hbase/client/ImmutableScan.java