@Override
  public void close() {
    try {
      scanner.close();
    } catch (IOException e) {
      LOG.warn("Failed to close scanner", e);
    }
  }
Wrap a {@link RegionScanner} as a {@link ResultScanner}.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/region/RegionScannerAsResultScanner.java