ahmedabu98 opened a new pull request, #38837:
URL: https://github.com/apache/beam/pull/38837
Adds read transforms that consume planned Iceberg changelog tasks and turn
them into Beam CDC rows.
`ReadFromChangelogs` reads task batches produced by `ChangelogScanner`:
- Unidirectional task batches are read and emitted directly as `INSERT` or
`DELETE` rows
- Large bidirectional task batches are read with full rows, filtered by
primary-key overlap range, and routed into keyed insert/delete streams for
downstream update resolution.
- Records outside the overlap range are safely emitted directly because
they cannot match an opposing change.
`LocalResolveDoFn` reads and resolves small bidirectional task batches in
memory.
`CdcResolver` centralizes the logic for reconciling deletes and inserts for
the same primary key. It emits changed pairs as `UPDATE_BEFORE` /
`UPDATE_AFTER`, and leaves unmatched rows as `DELETE` or `INSERT`. Duplicate
no-op pairs with identical non-PK fields are dropped.
------------------------
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