@Override
  public boolean next(List<? super ExtendedCell> result, ScannerContext scannerContext)
    throws IOException {
    return scanner.next(result, scannerContext);
  }
A simple delegation for doing filtering on {@link InternalScanner}.
hbase-examples/src/main/java/org/apache/hadoop/hbase/coprocessor/example/DelegatingInternalScanner.java