ClickHouse JOIN improvements timeline from 2022 to 2026 showing evolution of join algorithms, query planner optimization, and performance gains, including hash, sort-merge, grace hash, and parallel joins, with major milestones like predicate pushdown (180×), join reordering (1,450×), and runtime bloom filters (2.1×), highlighting enhanced scalability, memory efficiency, and multi-core query execution in ClickHouse.