src/Executor/ReferenceExecutor.php
private function collectAndExecuteSubfields(
        ObjectType $returnType,
        $fieldNodes,
        $path,
        &$result
    ) {
        $subFieldNodes = $this->collectSubFields($returnType, $fieldNodes);

        return $this->executeFields($returnType, $result, $path, $subFieldNodes);
    }
private function collectAndExecuteSubfields(
        ObjectType $returnType,
        $fieldNodes,
        $path,
        &$result
    ) {
        $subFieldNodes = $this->collectSubFields($returnType, $fieldNodes);

        return $this->executeFields($returnType, $result, $path, $subFieldNodes);
    }
@param FieldNode[] $fieldNodes
@param mixed[]     $path
@param mixed[]     $result

@return mixed[]|Promise|stdClass

@throws Error