code: public function build(ExpressionInterface $expression, array &$params = [])
      {
          $value = $expression->getValue();
  
          if ($value instanceof Query) {
              list ($sql, $params) = $this->queryBuilder->build($value, $params);
              return "($sql)";
          }
  
          $placeholder = static::PARAM_PREFIX . count($params);
          $params[$placeholder] = Json::encode($value);
  
          return "CAST($placeholder AS JSON)";
      }
docs: {@inheritdoc}
  @param JsonExpression|ExpressionInterface $expression the expression to be built