acrites opened a new pull request #11271: [BEAM-9624] Adds Convert to Accumulators operator for use in combiner lifting for streaming pipelines URL: https://github.com/apache/beam/pull/11271 The Convert To Accumulators operation is defined here: https://s.apache.org/beam-runner-api-combine-model#heading=h.h5697l1scd9x It is used by streaming pipelines where we want to lift the combiner into the GBK, but don't want to also lift the combiner into a PGBK before the GBK. This PGBK can behave badly with certain triggers. This PR also adds an implementation of Convert to Accumulators for the Go, Java, and Python SDKs. R: @robertwb, @lukecwik, @lostluck ------------------------ Thank you for your contribution! Follow this checklist to help us incorporate your contribution quickly and easily: - [ ] [**Choose reviewer(s)**](https://beam.apache.org/contribute/#make-your-change) and mention them in a comment (`R: @username`). - [ ] Format the pull request title like `[BEAM-XXX] Fixes bug in ApproximateQuantiles`, where you replace `BEAM-XXX` with the appropriate JIRA issue, if applicable. This will automatically link the pull request to the issue. - [ ] Update `CHANGES.md` with noteworthy changes. - [ ] If this contribution is large, please file an Apache [Individual Contributor License Agreement](https://www.apache.org/licenses/icla.pdf). See the [Contributor Guide](https://beam.apache.org/contribute) for more tips on [how to make review process smoother](https://beam.apache.org/contribute/#make-reviewers-job-easier). 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