src/Executor/Executor.php
protected static function executeFields(ExecutionContext $context, ObjectType $parent, $source, $fields)
    {
        return self::executeFieldsSerially($context, $parent, $source, $fields);
    }
protected static function executeFields(ExecutionContext $context, ObjectType $parent, $source, $fields)
    {
        return self::executeFieldsSerially($context, $parent, $source, $fields);
    }
protected static function executeFields ( ExecutionContext $ context , ObjectType $ parent , $ source , $ fields ) { return self :: executeFieldsSerially ( $ context , $ parent , $ source , $ fields ) ; }
Implements the "Evaluating selection sets" section of the spec for "read" mode.

@param ExecutionContext $context
@param ObjectType $parent
@param $source
@param $fields

@return array
Implements the Evaluating selection sets section of the spec for read mode .