Evergreen: Efficient Claim Verification for Semantic Aggregates
With recent semantic query processing engines, semantic aggregation has become a primitive operator, enabling the reduction of a relation into a natural language aggregate using an LLM. However, the resulting semantic aggregate may contain claims that are not grounded in the underlying relation. Verifying such claims is challenging: they often involve quantifiers, groupings, and comparisons over relations that far exceed LLM context windows and require a costly combination of semantic and symbolic processing. We present Evergreen, a system that recasts claim verification as a semantic query processing task with tailored optimizations and provenance capture. Evergreen compiles each claim i...
| Authors | Alexander W. Lee, Benjamin Han, Shayak Sen et al. |
|---|---|
| Primary category | cs.DB |
| Published | 28 April 2026 |
| Last updated at source | 2 July 2026 |
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