lostluck opened a new pull request, #34132:
URL: https://github.com/apache/beam/pull/34132
A basic no-behavior change refactoring to split the different stage kinds up
more cleanly into the 3 types: ordinary, Stateful, and aggregation.
While their differences don't come up everywhere, they in particular affect
when building bundles, and adding pending input elements to their stages.
* Ordinary stages are the simplest, and handle most simple batch stages.
* Stateful stages handle Stateful transforms, with state, timers, and a
requirement for keys. They don't respect triggers.
* Aggregations are Stateful stages that don't handle timers, have specific
conditions for triggering, as well as handling late data.
The hope of this change is to reduce the combinatorics complexity parts of
prism were suffering under, depending on which kind of stage was being handled.
This leads to some duplication between Stateful and aggregation stages, but
having clear handling of their differences should make up for it.
Part of prism work: #29650 and was originally mentioned in #33881
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