Big Data Technology & Architecture

Sep 24, 2020 · Big Data

HiveSQL Classic Optimization Cases: Partitioning, Subset Decomposition, and Percentile Approximation Improvements

This article presents three HiveSQL optimization case studies—restructuring a large‑scale query with partitioned tables, breaking a complex window‑function query into smaller subsets with joins, and refactoring excessive PERCENTILE_APPROX calls—demonstrating how each change reduces execution time from hours to minutes and improves overall performance.