Building a Native GPU Reader for Apache Iceberg

Apache Iceberg revolutionizes the interaction between distributed execution engines and storage by implementing a transactional metadata layer that tracks the exact state of a table at specific snapshots, improving operations such as partition pruning and schema evolution. However, this introduces complexity into the physical execution layer, particularly for GPU-native streaming engines that require uniform data structures for optimal performance. To address these challenges, a GPU-native Iceberg source operator was developed, which manages data ingestion through phases such as asynchronous physical fingerprinting, unified predicate pushdown, and recursive vector evolution, ensuring that the data conforms to the expected schema before reaching the GPU. This system effectively decouples the read-chunk size from the yield-batch size, maintaining pipeline stability by dynamically adapting to schema mismatches and optimizing memory usage. Despite the hidden complexity beneath the user-friendly DataFrame abstraction, future improvements are anticipated to handle deletes, reduce metadata latency, and manage VRAM spikes, emphasizing the importance of the source operator's efficiency in determining overall pipeline performance.

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