gemini-code-assist[bot] commented on PR #37191: URL: https://github.com/apache/beam/pull/37191#issuecomment-3693168796
## Summary of Changes Hello @ahmedabu98, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request delivers a robust Iceberg Change Data Capture (CDC) streaming source for Apache Beam. It allows Beam pipelines to consume a continuous stream of changes from an Iceberg table, including inserts, deletes, and updates. The implementation intelligently handles different types of change events, processing straightforward additions or removals directly, while employing a sophisticated reconciliation step for complex update scenarios. This significantly expands Beam's capabilities for real-time data integration with Iceberg. ### Highlights * **New CDC Streaming Source**: Introduced a comprehensive Change Data Capture (CDC) streaming source for Iceberg tables, enabling continuous processing of data modifications (inserts, deletes, updates) within Apache Beam pipelines. * **Changelog Task Processing**: Implemented a mechanism to scan incremental Iceberg snapshots and categorize changelog tasks into 'uniform' (all inserts or all deletes) and 'mixed' (both inserts and deletes for the same record) for optimized processing. * **Data Reconciliation for Updates**: Developed a reconciliation process for 'mixed' changelog tasks, using co-grouping by record ID to accurately identify and emit 'UPDATE_BEFORE' and 'UPDATE_AFTER' records, alongside pure inserts and deletes. * **Enhanced Read Utilities**: Extended `ReadUtils` with new methods and classes (`DeleteReader`, `BeamDeleteFilter`, `BeamDeleteReader`) to support reading and filtering based on Iceberg delete files, crucial for CDC functionality. * **Serialization of Iceberg Metadata**: Added new serializable classes (`SerializableDeleteFile`, `SerializableChangelogTask`, `ChangelogDescriptor`) to efficiently transfer Iceberg metadata and task information across Beam workers. * **Increased Component Visibility**: Adjusted the visibility of key classes and methods in `IncrementalScanSource` and `SerializableDataFile` to `public` or `protected`, facilitating their reuse and extension within the new CDC framework. 🧠**New Feature in Public Preview:** You can now enable **Memory** to help **Gemini Code Assist** learn from your team's feedback. 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