The document discusses the evolution of MySQL over the past 10 years. Key changes include refactoring code to separate processing phases, rewriting the optimizer, moving to UTF8 as the default character set, implementing a new iterator-based query executor, refactoring InnoDB, and transitioning to using services and components instead of plugins. It also summarizes how MySQL differed from the Drizzle approach in focusing on gradual, production-tested changes over rewriting everything from scratch.
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Simplifying MySQL, Pre-FOSDEM MySQL Days, Brussels, January 30, 2020.