code: public function build(ExpressionInterface $expression, array &$params = [])
      {
          $operand = $expression->getCondition();
          if ($operand === '') {
              return '';
          }
  
          $expession = $this->queryBuilder->buildCondition($operand, $params);
          return "{$this->getNegationOperator()} ($expession)";
      }
docs: Method builds the raw SQL from the $expression that will not be additionally
  escaped or quoted.
  
  @param ExpressionInterface|NotCondition $expression the expression to be built.
  @param array $params the binding parameters.
  @return string the raw SQL that will not be additionally escaped or quoted.