TheNeuralBit commented on a change in pull request #16101:
URL: https://github.com/apache/beam/pull/16101#discussion_r766199049
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File path: sdks/python/apache_beam/dataframe/transforms_test.py
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@@ -348,6 +350,44 @@ def test_rename(self):
}, errors='raise'))
+class FusionTest(unittest.TestCase):
+ @staticmethod
+ def fused_stages(p):
+ return p.result.metrics().query(
+ metrics.MetricsFilter().with_name(
+ fn_runner.FnApiRunner.NUM_FUSED_STAGES_COUNTER)
+ )['counters'][0].result
Review comment:
The other thought I had was just traversing the pipeline and counting
CoGBKs, but you're right that wouldn't help if side inputs mess up fusion.
Could we pull out the fusion logic?
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