kennknowles commented on a change in pull request #11835:
URL: https://github.com/apache/beam/pull/11835#discussion_r432064924
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File path: sdks/python/apache_beam/transforms/trigger_test.py
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@@ -518,6 +519,28 @@ def format_result(k_v):
'B-3': {10, 15, 16},
}.items())))
+ def test_never(self):
+ with TestPipeline() as p:
+
+ def construct_timestamped(k_t):
+ return TimestampedValue((k_t[0], k_t[1]), k_t[1])
+
+ def format_result(k_v):
+ return ('%s-%s' % (k_v[0], len(k_v[1])), set(k_v[1]))
+
+ result = (
+ p
+ | beam.Create([1, 1, 2, 3, 4, 5, 10, 11])
+ | beam.FlatMap(lambda t: [('A', t), ('B', t + 5)])
+ | beam.Map(construct_timestamped)
+ | beam.WindowInto(
+ FixedWindows(10),
+ trigger=Never(),
+ accumulation_mode=AccumulationMode.DISCARDING)
+ | beam.GroupByKey()
+ | beam.Map(format_result))
+ assert_that(result, equal_to([]))
Review comment:
Never trigger is misnamed. It means that the trigger itself never fires,
but that at window GC output is produced. That's why PAssert uses it to gather
the full result.
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