Preprint
Aug 2026
MDB-Link: Hierarchical Schema Linking for Multi-Database Text-to-SQL
This work proposes MDB-Link, a hierarchical schema-linking framework that retrieves question-relevant columns from a global index, aggregates retrieval evidence to shortlist databases, and uses a budget-aware large language model (LLM) for database reranking, table selection, and column grounding.
Beiyu Xu, Zhenyu Wu, Jiaoyan Chen et al.
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