code: public function build(ExpressionInterface $condition, array &$params = [])
      {
          $parts = $this->buildExpressionsFrom($condition, $params);
  
          if (empty($parts)) {
              return '';
          }
  
          if (count($parts) === 1) {
              return reset($parts);
          }
  
          return '(' . implode(") {$condition->getOperator()} (", $parts) . ')';
      }
docs: Method builds the raw SQL from the $expression that will not be additionally
  escaped or quoted.
  
  @param ExpressionInterface|ConjunctionCondition $condition the expression to be built.
  @param array $params the binding parameters.
  @return string the raw SQL that will not be additionally escaped or quoted.