TheNeuralBit commented on a change in pull request #16101:
URL: https://github.com/apache/beam/pull/16101#discussion_r765260711
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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:
It feels a little odd to verify this through a metric in `FnApiRunner`.
Could we instrument DataFrameTransform expansion isntead?
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