Sep 10, 2021 · Databases

Understanding MySQL 8.0 Derived Condition Pushdown Optimization and Its Impact on User Variables

The article explains MySQL 8.0.22's new optimizer_switch variable derived_condition_pushdown, shows how enabling it can cause unexpected results with user‑defined variables in outer WHERE clauses, provides test cases, explains the underlying behavior, and offers three practical solutions.

derived_condition_pushdownmysqloptimizer

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Understanding MySQL 8.0 Derived Condition Pushdown Optimization and Its Impact on User Variables