josh-fell commented on a change in pull request #16732:
URL: https://github.com/apache/airflow/pull/16732#discussion_r664187180



##########
File path: airflow/models/baseoperator.py
##########
@@ -1540,22 +1541,24 @@ def inherits_from_dummy_operator(self):
         return getattr(self, '_is_dummy', False)
 
 
-def chain(*tasks: Union[BaseOperator, Sequence[BaseOperator]]):
+def chain(*tasks: Union[BaseOperator, "XComArg", Sequence[BaseOperator], 
Sequence["XComArg"]]):
     r"""
     Given a number of tasks, builds a dependency chain.
-    Support mix airflow.models.BaseOperator and 
List[airflow.models.BaseOperator].
-    If you want to chain between two List[airflow.models.BaseOperator], have to
-    make sure they have same length.
+    Support mix airflow.models.BaseOperator, 
List[airflow.models.BaseOperator], XComArg, and
+    List[airflow.models.XComArg]. If you want to chain between two 
List[airflow.models.BaseOperator]
+    or List[airflow.models.XComArg], you have to make sure they have same 
length.

Review comment:
       👍 Nice catch!

##########
File path: airflow/models/baseoperator.py
##########
@@ -1540,22 +1541,24 @@ def inherits_from_dummy_operator(self):
         return getattr(self, '_is_dummy', False)
 
 
-def chain(*tasks: Union[BaseOperator, Sequence[BaseOperator]]):
+def chain(*tasks: Union[BaseOperator, "XComArg", Sequence[BaseOperator], 
Sequence["XComArg"]]):
     r"""
     Given a number of tasks, builds a dependency chain.
-    Support mix airflow.models.BaseOperator and 
List[airflow.models.BaseOperator].
-    If you want to chain between two List[airflow.models.BaseOperator], have to
-    make sure they have same length.
+    Support mix airflow.models.BaseOperator, 
List[airflow.models.BaseOperator], XComArg, and
+    List[airflow.models.XComArg]. If you want to chain between two 
List[airflow.models.BaseOperator]
+    or List[airflow.models.XComArg], you have to make sure they have same 
length.

Review comment:
       👍 Nice catch! Updated.




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