Big Data Technology Tribe
Aug 5, 2025 · Big Data
How Spark’s Catalyst Optimizer Transforms SQL Queries: Trees, Rules, and Code Generation
This article explains Spark SQL’s Catalyst optimizer, describing its extensible design, tree‑based representation, rule‑driven transformations, batch execution to a fixed point, and how Scala’s pattern matching and quasiquotes enable efficient analysis, logical optimization, physical planning, and code generation.
Catalyst OptimizerQuery OptimizationScala
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