kennknowles commented on a change in pull request #11835:
URL: https://github.com/apache/beam/pull/11835#discussion_r434012668
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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:
Good point about that in PAssert. Though isn't the triggering just "fire
at GC" and the windowing nothing special? Previously, it depended on side
inputs which tend to come later in a runner's lifecycle.
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