Consider small periodic impulses as bounded.

robertwb · robertwb · commit 640e8dfa2c49 · 2025-04-25T10:32:07.000-07:00
diff --git a/sdks/python/apache_beam/transforms/periodicsequence.py b/sdks/python/apache_beam/transforms/periodicsequence.py
@@ -192,11 +192,15 @@ def __init__(
     self.apply_windowing = apply_windowing
 
   def expand(self, pbegin):
-    result = (
+    sequence = (
         pbegin
         | 'ImpulseElement' >> beam.Create(
             [(self.start_ts, self.stop_ts, self.interval)])
-        | 'GenSequence' >> beam.ParDo(ImpulseSeqGenDoFn())
+        | 'GenSequence' >> beam.ParDo(ImpulseSeqGenDoFn()))
+    if self.stop_ts - self.start_ts < 5:
+        sequence.is_bounded = True
+    result = (
+        sequence
         | 'MapToTimestamped' >> beam.Map(lambda tt: TimestampedValue(tt, tt)))
     if self.apply_windowing:
       result = result | 'ApplyWindowing' >> beam.WindowInto(
