code: protected function validateConjunctionCondition($operator, $condition)
      {
          if (!is_array($condition) || !ArrayHelper::isIndexed($condition)) {
              $this->addError($this->filterAttributeName, $this->parseErrorMessage('operatorRequireMultipleOperands', ['operator' => $operator]));
              return;
          }
  
          foreach ($condition as $part) {
              $this->validateCondition($part);
          }
      }
docs: Validates conjunction condition that consists of multiple independent ones.
  This covers such operators as `and` and `or`.
  @param string $operator raw operator control keyword.
  @param mixed $condition raw condition.