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TL;DR: DuckDB has fully parallelised range joins that can efficiently join millions of range predicates. Range intersection joins are an important operation in areas such as temporal analytics, and occur when two inequality conditions are present in a join predicate. Database implementations often rely on slow O(N^2) algorithms that compare every pair of rows for these operations. Instead, DuckDB leverages its fast sorting logic to implement two highly optimized parallel join operators for these kinds of range predicates, resulting in 20-30x faster queries. With these operators, DuckDB can be used effectively in more time-series-oriented use cases.