fix ArgByRef

src/ray/common/task/task_spec.cc

@@ -120,7 +120,7 @@ ObjectID TaskSpecification::ReturnId(size_t return_index) const {
 }
 
 bool TaskSpecification::ArgByRef(size_t arg_index) const {
-  return message_->args(arg_index).object_ref().object_id() != "";
+  return message_->args(arg_index).object_ref().has_object_ref();
 }
 
 ObjectID TaskSpecification::ArgId(size_t arg_index) const {

src/ray/ray_exported_symbols.lds

@@ -21,6 +21,7 @@
 *ray*TaskID*
 *ray*ActorID*
 *ray*ObjectID*
+*ray*ObjectReference*
 # Others
 *ray*CoreWorker*
 *PyInit*

src/ray/ray_version_script.lds

@@ -23,6 +23,7 @@ VERSION_1.0 {
         *ray*TaskID*;
         *ray*ActorID*;
         *ray*ObjectID*;
+        *ray*ObjectReference*;
         # Others
         *ray*CoreWorker*;
         *PyInit*;