jk-shah opened a new issue, #41311: URL: https://github.com/apache/beam/issues/41311
### What would you like to happen? Introduce a declarative `DeltaJoin` transform (or optimizer rule/mode) that converts high-cardinality dual-stream joins into **indexed bidirectional lookups** against external indexed storage (for example Bigtable, Spanner, Apache Paimon, or Redis) paired with bounded in-memory LRU caching—extending Beam existing async `Enrichment` machinery to symmetric dual-stream joins. ### Motivation Traditional dual-stream joins duplicate TBs of history in runner state. Flink 2.1/2.2 (FLIP-486 Delta Join) showed >80% CPU/memory savings by externalizing join state into indexed streaming storage. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
