code: private function buildExpressionsFrom(ExpressionInterface $condition, &$params = [])
      {
          $parts = [];
          foreach ($condition->getExpressions() as $condition) {
              if (is_array($condition)) {
                  $condition = $this->queryBuilder->buildCondition($condition, $params);
              }
              if ($condition instanceof ExpressionInterface) {
                  $condition = $this->queryBuilder->buildExpression($condition, $params);
              }
              if ($condition !== '') {
                  $parts[] = $condition;
              }
          }
  
          return $parts;
      }
docs: Builds expressions, that are stored in $condition
  
  @param ExpressionInterface|ConjunctionCondition $condition the expression to be built.
  @param array $params the binding parameters.
  @return string[]