row1                 column=f:isDel, timestamp=1513953705613, value=1
 row1                 column=f:name, timestamp=1513953725029, value=name1
 row2                 column=f:isDel, timestamp=1513953744613, value=0
 row2                 column=f:name, timestamp=1513953730348, value=name2
 row3                 column=f:isDel, timestamp=1513953751332, value=0
 row3                 column=f:name, timestamp=1513953734698, value=name3

class RegionScannerImpl implements RegionScanner {

    RegionScannerImpl(Scan scan, List<KeyValueScanner> additionalScanners, HRegion region)
        throws IOException {
      this.region = region;
      this.maxResultSize = scan.getMaxResultSize();
      if (scan.hasFilter()) {
        this.filter = new FilterWrapper(scan.getFilter());
      } else {
        this.filter = null;
      }
    }
   ....
}

/**
 * This is a Filter wrapper class which is used in the server side. Some filter
 * related hooks can be defined in this wrapper. The only way to create a
 * FilterWrapper instance is passing a client side Filter instance through
 * {@link org.apache.hadoop.hbase.client.Scan#getFilter()}.
 * 
 */
 
final public class FilterWrapper extends Filter {
  Filter filter = null;

  public FilterWrapper( Filter filter ) {
    if (null == filter) {
      // ensure the filter instance is not null
      throw new NullPointerException("Cannot create FilterWrapper with null Filter");
    }
    this.filter = filter;
  }

 
  public enum FilterRowRetCode {
    NOT_CALLED,
    INCLUDE,     // corresponds to filter.filterRow() returning false
    EXCLUDE      // corresponds to filter.filterRow() returning true
  }
  
  public FilterRowRetCode filterRowCellsWithRet(List<Cell> kvs) throws IOException {
    this.filter.filterRowCells(kvs);
    if (!kvs.isEmpty()) {
      if (this.filter.filterRow()) {
        kvs.clear();
        return FilterRowRetCode.EXCLUDE;
      }
      return FilterRowRetCode.INCLUDE;
    }
    return FilterRowRetCode.NOT_CALLED;
  }

 
}