TheNeuralBit commented on PR #17384:
URL: https://github.com/apache/beam/pull/17384#issuecomment-1112774127
@robertwb I think this is largely ready. I added a new `WindowedBatch`
implementation, `HomogeneousWindowedBatch` which is effectively a wrapper
around `WindowedValue`, where we know the value is a batch. We now enforce that
batches are partitioned by `(timestamp, windows, pane_info)` and only create
`HomoegeneousWindowedBatch` instances.
The old implementation, `ConcreteWindowedBatch` isn't used, it's probably
worth just backing that out and saving it for a future PR.
Other notes: I've added support for {Timestamp, PaneInfo, Window}Param on
process_batch (and we validate only these are used at construction time). Other
DoFn params that were discussed in https://s.apache.org/batched-dofns are not
yet supported.
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