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Constant Folding

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DataFunSummit
DataFunSummit
Dec 9, 2024 · Big Data

Spark SQL Expression Optimizations: LIKE ALL/ANY, TRIM Function Improvements, and Constant Folding

This article examines Spark SQL expression-level optimizations, focusing on redesigning LIKE ALL and LIKE ANY to reduce memory and stack usage, refactoring the TRIM function for better code reuse and performance, and implementing constant folding to cache computed constant expressions, thereby enhancing query efficiency in big-data workloads.

Constant FoldingExpression OptimizationPerformance Tuning
0 likes · 16 min read
Spark SQL Expression Optimizations: LIKE ALL/ANY, TRIM Function Improvements, and Constant Folding
macrozheng
macrozheng
Jul 3, 2023 · Fundamentals

Why Java Creates Only One String Object: Understanding Constant Folding

This article explains how Java's compiler optimizes string concatenation through constant folding, the rules that define compile‑time constants, and why only a single String object is created in many seemingly multiple‑object scenarios.

Compile-time ConstantConstant FoldingJVM
0 likes · 11 min read
Why Java Creates Only One String Object: Understanding Constant Folding