saavannanavati commented on a change in pull request #12352:
URL: https://github.com/apache/beam/pull/12352#discussion_r468328472
##########
File path: sdks/python/apache_beam/typehints/typecheck.py
##########
@@ -265,3 +269,95 @@ def visit_transform(self, applied_transform):
transform.get_type_hints(),
applied_transform.full_label),
applied_transform.full_label)
+
+
+class PerformanceTypeCheckVisitor(pipeline.PipelineVisitor):
+
+ _in_combine = False
+ combine_classes = (
+ core.CombineFn,
+ core.CombinePerKey,
+ core.CombineValuesDoFn,
+ core.CombineValues,
+ core.CombineGlobally)
+
+ def enter_composite_transform(self, applied_transform):
+ if isinstance(applied_transform.transform, self.combine_classes):
+ self._in_combine = True
+
+ def leave_composite_transform(self, applied_transform):
+ if isinstance(applied_transform.transform, self.combine_classes):
+ self._in_combine = False
+
+ def visit_transform(self, applied_transform):
+ transform = applied_transform.transform
+ if isinstance(transform, core.ParDo) and not self._in_combine:
+ # Store output type hints in current transform
+ transform.fn._runtime_output_constraints = {
+ applied_transform.full_label: self.get_output_type_hints(transform)
+ }
+
+ # Store input type hints in producer transform
+ producer = applied_transform.inputs[0].producer
+ if (hasattr(producer, 'transform') and
Review comment:
An `Impulse` has no `transform` attribute
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