query-planner — RedDB blog

May 2026 Engineering · 17 · 11 min Chunking inside the engine: when the DB owns segmentation Most RAG stacks chunk in Python glue between Postgres and a vector store. The result is a second pipeline that drifts. This post walks through what it looks like when chunking is a declarative rule attached to a column, reranking is a query operator, and the engine — not the application — owns segmentation.
Engineering · 17 · 8 min Hybrid search done right: lexical, vector, and filter in one plan A walk through the RedDB query planner fusing BM25, vector similarity, and a structured filter into a single execution plan — with EXPLAIN output, the cost model behind it, and what happens on the edge cases that trip up naive two-stage rerankers.

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