code: @Override
      public boolean columnCondition(Writable writable) {
          BooleanWritable booleanWritable = (BooleanWritable) writable;
          return booleanWritable.get();
      }
docs: Returns whether the given element
  meets the condition set by this operation
  
  @param writable the element to test
  @return true if the condition is met
  false otherwise