damccorm commented on code in PR #36001:
URL: https://github.com/apache/beam/pull/36001#discussion_r2316413564


##########
sdks/python/apache_beam/runners/direct/direct_runner.py:
##########
@@ -202,9 +201,17 @@ def visit_transform(self, applied_ptransform):
     # Use BundleBasedDirectRunner if other runners are missing needed features.
     runner = BundleBasedDirectRunner()
 
+    # Check if transform overrides are needed - if so,
+    # use BundleBasedDirectRunner
+    # since Prism does not support transform overrides
+    transform_overrides = _get_transform_overrides(options)
+    if transform_overrides:

Review Comment:
   > I think this is a better approach because then the basic pubsub write 
transform works as is and overriding is just for specialization.
   
   I think this is the key thing - ideally you would not need to implement an 
override for this to work on arbitrary runners; overrides should be the 
exceptional case



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