TLDR Tech / Dev
How we made WINDOW JOIN parallel and vectorized
QuestDB recently optimized its WINDOW JOIN operator by implementing data-level parallelism and SIMD-vectorized aggregation kernels, resulting in performance gains up to 25x faster than competitors. By using a dedicated operator that recognizes window structures and organizes data into contiguous memory buffers, the system minimizes overhead and maximizes CPU efficiency for demanding time-series workloads.
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