Hi Devs, I have pushed a working prototype to my public fork demonstrating the BitmapType integrated with FieldRoaringBitmap32Agg. This includes four passing unit tests.
The link to the prototype is available in the Google Doc, and you can also find it here: https://github.com/Prajwal-banakar/fluss/tree/RoaringBitmap-prototype The Google Doc link remains the same. I look forward to your feedback. Best regards, Prajwal Banakar On Sun, 1 Mar, 2026, 11:49 am Prajwal Banakar, <[email protected]> wrote: > Hi everyone, > > I would like to start a discussion on the proposal for Native Bitmap > Integration & Stateless Pushdown Aggregation. > > This proposal enables end-to-end native support for the BITMAP type in > Fluss and integrates it with the existing aggregation merge engine to > support server-side bitmap union pushdown. The goal is to reduce network > transfer and offload DISTINCT-style aggregation from Flink to the > TabletServer. > > Key highlights of the proposal include: > > - Type System: Promoting BITMAP to a first-class logical type. > - UDF Suite: Introducing BITMAP_BUILD, BITMAP_OR_AGG, and > BITMAP_CARDINALITY (aligned with FLIP-556 and StarRocks semantics). > - Optimizer: Planner-based pushdown via applyAggregates in the Flink > connector. > - Safety: No changes to LogRecordBatch or WAL, making this strictly > additive and migration-free. > > You can find the full proposal document here: > > https://docs.google.com/document/d/1sDhfkmo-w-UTvo2n3rsY1lytSSryswfkI83cSdka8s0/edit?usp=sharing > > I would appreciate feedback on the public interfaces, pushdown > constraints, and overall scope. > > Best regards, > Prajwal Banakar >
