EviLink: Multi-Path Schema Linking with Uncertainty-Guided Evidence Acquisition for Large-Scale Text-to-SQL
EviLink reframes schema linking as inferring necessary schema elements across multiple possible SQL paths rather than picking one path deterministically. It uses multi-hypothesis grounding and uncertainty modeling to identify required versus uncertain schema items, acquiring evidence only when needed. This approach balances schema completeness with token cost by preserving information relevant to all plausible SQL solutions.