AnandInguva commented on code in PR #27373:
URL: https://github.com/apache/beam/pull/27373#discussion_r1258419320
##########
sdks/python/apache_beam/runners/portability/fn_api_runner/fn_runner.py:
##########
@@ -852,6 +859,9 @@ def _execute_bundle(self,
(consuming_stage_name, consuming_transform, buffer_id))
# We enqueue all of the pending output buffers to be scheduled at the
# MAX_TIMESTAMP for the downstream stage.
+ # buffer is None. Empty PCollection. Bug
Review Comment:
```suggestion
```
##########
sdks/python/apache_beam/runners/portability/fn_api_runner/fn_runner.py:
##########
@@ -852,6 +859,9 @@ def _execute_bundle(self,
(consuming_stage_name, consuming_transform, buffer_id))
# We enqueue all of the pending output buffers to be scheduled at the
# MAX_TIMESTAMP for the downstream stage.
+ # buffer is None. Empty PCollection. Bug
+ if not buffer:
+ buffer = ListBuffer(None)
Review Comment:
```suggestion
```
##########
sdks/python/apache_beam/runners/portability/fn_api_runner/fn_runner.py:
##########
@@ -852,6 +859,9 @@ def _execute_bundle(self,
(consuming_stage_name, consuming_transform, buffer_id))
# We enqueue all of the pending output buffers to be scheduled at the
# MAX_TIMESTAMP for the downstream stage.
+ # buffer is None. Empty PCollection. Bug
+ if not buffer:
Review Comment:
```suggestion
```
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