Complex databases are essential in today’s technology landscape, yet many developers view them as mysterious black boxes. Despite this, innovation in database technology continues, with projects like Hadoop paving the way and ClickBench highlighting over 50 databases. New trends like rewriting big data processes in Rust constantly emerge. Apache DataFusion stands out as a comprehensive tool for building custom databases, with layers for query parsing, logical and physical planning, and execution. By extending DataFusion, developers can create unique operators and optimize query performance, ultimately crafting their version of a top-notch database experience. This process involves writing custom execution plans, hooking into planners, and adding optimization rules.
https://www.denormalized.io/blog/building-databases