private static void clearAndClose(List<KeyValueScanner> scanners) {
    if (scanners == null) {
      return;
    }
    for (KeyValueScanner s : scanners) {
      s.close();
    }
    scanners.clear();
  }
See {@link #trySkipToNextRow(ExtendedCell)}
@param cell current cell
@return true means skip to next column, false means not
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/StoreScanner.java