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Update refcounts after pipeline reconstruction. #2432

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robertwb wants to merge 1 commit into from
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Update refcounts after pipeline reconstruction. #2432

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1 change: 1 addition & 0 deletions sdks/python/apache_beam/pipeline.py
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Original file line number Diff line number Diff line change
Expand Up @@ -546,4 +546,5 @@ def from_runner_api(proto, context):
if pc not in result.inputs:
pc.producer = result
pc.tag = tag
result.update_input_refcounts()
return result
6 changes: 6 additions & 0 deletions sdks/python/apache_beam/transforms/ptransform_test.py
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Expand Up @@ -435,6 +435,12 @@ def test_flatten_no_pcollections(self):
assert_that(result, equal_to([]))
pipeline.run()

def test_flatten_same_pcollections(self):
pipeline = TestPipeline()
pc = pipeline | beam.Create(['a', 'b'])
assert_that((pc, pc, pc) | beam.Flatten(), equal_to(['a', 'b'] * 3))
pipeline.run()

def test_flatten_pcollections_in_iterable(self):
pipeline = TestPipeline()
pcoll_1 = pipeline | 'Start 1' >> beam.Create([0, 1, 2, 3])
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