code: protected Column populateFkey(String rlName, Object rlValue, long timestamp) throws PropertyAccessException {
          Column col = new Column();
          col.setName(PropertyAccessorFactory.STRING.toBytes(rlName));
          col.setValue(PropertyAccessorHelper.getBytes(rlValue));
          col.setTimestamp(timestamp);
          return col;
      }
docs: Populates foreign key as column.
  
  @param rlName
  relation name
  @param rlValue
  relation value
  @param timestamp
  the timestamp
  @return the column
  @throws PropertyAccessException
  the property access exception