@Override
    public boolean next(List<? super ExtendedCell> result, ScannerContext scannerContext)
      throws IOException {
      return false;
    }
Don't return any data from a scan by creating a custom {@link StoreScanner}.
hbase-server/src/test/java/org/apache/hadoop/hbase/coprocessor/TestRegionObserverScannerOpenHook.java