Provide a option to see rows behind a delete in a time range queries

	    @Override
	    public KeyValueScanner preStoreScannerOpen(final ObserverContext<RegionCoprocessorEnvironment> c,
	        final Store store, final Scan scan, final NavigableSet<byte[]> targetCols,
	        final KeyValueScanner s) throws IOException {
	
	      if (scan.isRaw() || ScanInfoUtil.isKeepDeletedCells(store.getScanInfo()) || scan.getTimeRange().getMax() == HConstants.LATEST_TIMESTAMP || TransactionUtil.isTransactionalTimestamp(scan.getTimeRange().getMax())) {
	        return s;
	      }
	
	      ScanInfo scanInfo = ScanInfoUtil.cloneScanInfoWithKeepDeletedCells(store.getScanInfo());
	      return new StoreScanner(store, scanInfo, scan, targetCols,
	          c.getEnvironment().getRegion().getReadpoint(scan.getIsolationLevel()));
	    }