[PR] [Iceberg CDC] Finish wiring CDC source together and add external API [beam]

Mon, 03 Aug 2026 17:38:21 -0700 


ahmedabu98 opened a new pull request, #39600:
URL: https://github.com/apache/beam/pull/39600

   Finalizes the IcebergIO CDC streaming source. Introduces top-level 
IncrementalChangelogSource to replace IncrementalAppendSource.
   
   Reads a table's changelog one snapshot at a time and emits net per-snapshot 
changes as CDC rows. Bi-directional groups too large to resolve in memory are 
windowed per snapshot (SnapshotWindowFn), grouped by primary key, and 
reconciled by ResolveChanges, while small groups continue to resolve locally 
(LocalResolveDoFn) without a shuffle.
   
   Adds user-facing options for CDC metadata columns, a custom watermark column 
with its time unit, and a maximum snapshot discovery delay. 
   
   Removes the now-unused IncrementalScanSource, ReadFromTasks, and 
WatchForSnapshots.
   
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