Billion Cell Spreadsheets with Incremental Computation
I figured this might be interesting for some here. This is a demo we built to showcase computation with Feldera (SQL compiled to Rust circuits that evaluate input incrementally): https://github.com/feldera/feldera The gist of it is that if you update a cell, we incrementally update the spreadsheet which means we will only emit a minimal amount of changes for the cells affected by your update. The nice thing about it is that this is something that Feldera does automatically (and it would do that for any SQL that you end up writing, so it doesn't have to be a spreadsheet,…
In plain words
Billion Cell Spreadsheets with Incremental Computation is a demo built on Feldera that handles large spreadsheets by computing only the minimal changes needed when cells are updated. The system compiles SQL queries into Rust circuits that evaluate input incrementally, automatically propagating changes through dependent cells. It's designed for developers working with large-scale data computations who need efficient recalculation of affected values rather than full recalculation.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
I figured this might be interesting for some here. This is a demo we built to showcase computation with Feldera (SQL compiled to Rust circuits that evaluate input incrementally): https://github.com/feldera/feldera The gist of it is that if you update a cell, we incrementally update the spreadsheet which means we will only emit a minimal amount of changes for the cells affected by your update. The nice thing about it is that this is something that Feldera does automatically (and it would do that for any SQL that you end up writing, so it doesn't have to be a spreadsheet, but a spreadsheet is a nice example that everyone understands and knows about). There is a more detailed explanation in this video https://www.youtube.com/watch?v=ROa4duVqoOs if you're interested what's going on under the hood -- or if you prefer reading about it we have an article series that goes over all the parts of the demo 1. Feldera SQL (gets compiled to Rust) https://docs.feldera.com/use_cases/real_time_apps/part1 2. API server (Rust/Axum hosted on fly.io) https://docs.feldera.com/use_cases/real_time_apps/part2 3. egui web Client (Rust compiled to WebAssembly) https://docs.feldera.com/use_cases/real_time_apps/part3
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