EvoSQL: Memory-Augmented Critic-Generator Co-Evolution for Text-to-SQL

• URL: http://arxiv.org/abs/2607.20489v1
• Date: Thu, 04 Jun 2026 14:21:19 GMT
• Title: EvoSQL: Memory-Augmented Critic-Generator Co-Evolution for Text-to-SQL
• Abstract summary: Evowen is a co-evolution of an interaction between a generator and a critic.<n>To strengthen the generator-critic pair, we introduce a Self-Distillation Policy (SDPO)<n>Experiments show that Evowen consistently improves open-source models over Maj@16 baselines.
• Score: 12.094895321584152
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Text-to-SQL has advanced rapidly with large language models, but complex database queries still require reasoning beyond one-shot generation, including multi-step decomposition, execution-based diagnosis, and targeted correction. We present EvoSQL, a co-evolution framework that formulates SQL synthesis as an iterative interaction between a generator and a critic. EvoSQL maintains a contextualized candidate memory, verifies SQL candidates with both execution signals and LLM-based critique, and updates its memory through utility-guided aggregation. To strengthen the underlying generator-critic pair, we further introduce a Self-Distillation Policy Optimization (SDPO) fine-tuning stage that injects execution-aware supervision into modern coding LLM backbones. Experiments on Spider and BIRD show that EvoSQL consistently improves open-source models over Maj@16 baselines, with particularly large gains on BIRD-Dev, ranging from +1.37% for Qwen3-4B to +9.19% for Qwen2.5-Coder-3B. SDPO initialization further improves selected backbones on Spider-Test and BIRD-Dev. These results suggest that memory-grounded co-evolution is an effective path toward more reliable and generalizable Text-to-SQL systems. Code is available at https://github.com/valleysprings/EvoSQL.

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