code: protected function buildConjunctionCondition($operator, $condition)
      {
          if (isset($this->queryOperatorMap[$operator])) {
              $operator = $this->queryOperatorMap[$operator];
          }
          $result = [$operator];
  
          foreach ($condition as $part) {
              $result[] = $this->buildCondition($part);
          }
  
          return $result;
      }
docs: Builds conjunction condition, which consists of multiple independent ones.
  It covers such operators as `and` and `or`.
  @param string $operator operator keyword.
  @param mixed $condition raw condition.
  @return array actual condition.