Velox Execution Engine

Velox is Meta's open-source, high-performance vectorized SQL execution engine designed to power OLAP systems. It separates query planning (handled by Presto, Spark, Trino) from runtime execution, providing a pluggable backend that operates on columnar batches (vectors) rather than individual rows. Velox implements vectorized evaluation, SIMD operations, and adaptive algorithms to make SQL queries 10–100x faster than traditional row-based executors. Velox is production-grade: Meta uses it internally at massive scale; Presto, Spark, and Trino all integrate with Velox to accelerate queries. Organizations running petabyte-scale data warehouses rely on engineers who can tune Velox for specific query patterns and implement custom execution strategies.