c-horn commented on issue #21746: [SPARK-24699] [SS]Make watermarks work with Trigger.Once by saving updated watermark to commit log URL: https://github.com/apache/spark/pull/21746#issuecomment-453862328 I believe the current fix only fully processes the on-hand data when window aggregating when you run the Trigger.Once twice. It shouldn't matter that you are using pyspark, it is the same streaming code.
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