riteshghorse commented on code in PR #23641:
URL: https://github.com/apache/beam/pull/23641#discussion_r998319587


##########
sdks/go/pkg/beam/core/runtime/graphx/translate.go:
##########
@@ -682,6 +683,19 @@ func (m *marshaller) expandCrossLanguage(namedEdge 
NamedEdge) (string, error) {
                EnvironmentId: m.addDefaultEnv(),
        }
 
+       // Add the coders for output types in the marshaller even if expanded 
is nil
+       // to set the output coder request field in expansion request for 
python external transforms.
+       names := strings.Split(spec.Urn, ":")
+       if len(names) > 2 && names[2] == "python" {

Review Comment:
   That was with an earlier approach though which I made it simpler later in 
latest commit. Testing it locally for commit 
[f69475d](https://github.com/apache/beam/pull/23641/commits/f69475dc51aa4c9d4c43c0e089db5d8e254a5250)



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