Anatomy of a 120-Line Prompt That Lets an LLM Rewrite Physical Plans
DBPlanBench gets GPT-5 to deliver a 4.78× geometric-mean speedup on DataFusion TPC-H SF10 by letting the model rewrite physical plans directly. I read its sql_optimization_prompts.py end to end — 120 lines, 30 of methodology, 90 of contract. That ratio is the most transferable thing in the paper.