GGC: Selective Query Correction for Reliable Text-to-SPARQL Generation

Researchers propose Generator-Gate-Corrector (GGC), a framework for reliable LLM-based Text-to-SPARQL generation, which improves query-level accuracy from 90.23% to 98.33% on MCQA while reducing inference overhead by 45% compared with correcting all generated queries. The framework selectively corrects high-risk queries to avoid unnecessary modifications and degradation of correct queries.

arXiv:2607.28082v1 Announce Type: new Abstract: Large language models LLMs have demonstrated strong capabilities in structured query generation, making them a natural choice for Text-to-SPARQL, which translates natural language questions into executable SPARQL queries over knowledge graphs. However, their initial outputs remain unreliable: generated queries may be executable yet semantically misaligned with input questions, leading to incorrect retrieval. To address this issue, we propose Generator-Gate-Corrector GGC , a framework for reliable LLM-based Text-to-SPARQL generation. GGC first uses a Generator to produce an initial query, then applies a Gate to predict whether correction is needed, and finally invokes a Corrector only for selected high-risk queries. This selective correction mechanism avoids unnecessary modifications and reduces the risk of degrading originally correct queries. Experiments on MCQA show that GGC improves query-level accuracy from 90.23\% to 98.33\% while reducing inference overhead by 45\% compared with correcting all generated queries. Ablation studies show that the Gate is robust across thresholds and that Corrector training data composition affects correction effectiveness and stability. Overall, the results demonstrate that selective correction enhances the accuracy, reliability, and efficiency of LLM-based text-to-SPARQL generation.