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Initial prototype of using Beam transforms directly in a Flink pipeline.
Handling DataStream, windowing, and more complex types will come in a future PR.
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(Looks like I'm going to have to rebase this on the org.apache.beam.runners.core.construction move...)
(Looks like I'm going to have to rebase this on the org.apache.beam.runners.core.construction move...)
Done. PTAL.
I've addressed all your comments so I'm going to go on your LGTM and merge this.
There are still lots of nullness checks suppressed that presumably should be fixed, not suppressed. I didn't see any systemic reason to disable checking.
Most of these are because Map.get() uses nulls rather than exceptions to indicate keys aren't there (that tautologically should be). Cleaned up at https://github.com/apache/beam/pull/30488