---
title: "Bidirectional Semantic Enhancement for Schema Routing Across"
description: "The authors propose Bi-SR, which works on both sides. 36 references. Among them: 0."
authors: ["Yuyang Wu", "Xiaoliang Wang", "Cam-Tu Nguyen"]
year: 2026
venue: "Findings of the Association for Computational Linguistics: ACL 2026"
source: "https://aclanthology.org/2026.findings-acl.369/"
doi: "10.18653/v1/2026.findings-acl.369"
licence: "CC BY 4.0 (ACL Anthology)"
licence_url: "https://creativecommons.org/licenses/by/4.0/"
summary_licence: "Elamur Cosmic License"
canonical: "https://research.elamur.ai/free/en/papers/wu-2026-bidirectional-semantic-enhancement-schema-routing/"
---
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# Bidirectional Semantic Enhancement for Schema Routing Across Large-Scale Databases

**Authors:** [Yuyang Wu](https://md.research.elamur.ai/free/en/authors/yuyang-wu/), [Xiaoliang Wang](https://md.research.elamur.ai/free/en/authors/xiaoliang-wang/) and [Cam-Tu Nguyen](https://md.research.elamur.ai/free/en/authors/cam-tu-nguyen/) · **Year:** 2026 · **Venue:** [Findings of the Association for Computational Linguistics: ACL 2026](https://md.research.elamur.ai/free/en/venues/findings/) ([Findings of the Association for Computational Linguistics 2026](https://md.research.elamur.ai/free/en/venues/findings/2026/)) · **Publisher:** [Association for Computational Linguistics](https://md.research.elamur.ai/free/en/publishers/association-for-computational-linguistics/) · **Licence:** [CC BY 4.0 (ACL Anthology)](https://creativecommons.org/licenses/by/4.0/)

**Links:** [Publisher's page](https://aclanthology.org/2026.findings-acl.369/) · [PDF](https://aclanthology.org/2026.findings-acl.369.pdf) · [DOI 10.18653/v1/2026.findings-acl.369](https://doi.org/10.18653/v1/2026.findings-acl.369) · [OpenAlex](https://openalex.org/W7166872213)

**Citations:** 0 citations (OpenAlex, 2026-10-14)

## Summary
The paper tackles schema routing: picking the few relevant tables from repositories that may hold thousands of them before an LLM writes SQL. The main obstacle is semantic. Users ask in everyday words, while real schemas often use cryptic identifiers. Earlier methods enrich only one side, either expanding the query or walking schema graphs that rely on foreign keys. The authors propose Bi-SR, which works on both sides. Offline, an LLM writes a functional explanation and domain keywords for every table, and these descriptions are indexed as vectors. Online, the system guesses likely table descriptions and names for the incoming question, retrieves candidates, and then prunes them more finely. A dense retriever is trained with a dual-augmented contrastive objective, matching LLM-expanded queries against the enriched table descriptions. On routing benchmarks built from BIRD and Spider, Bi-SR reports state-of-the-art recall and execution accuracy. It also stays robust when the search pool grows with unseen tables, which matters for real data warehouses and for running cheaper, smaller models.

## Key points
- Each table is represented as a triplet of DatabaseID, TableID, and an LLM-generated Explanation. Training queries are the question joined to an LLM-produced "Target Potential Schema" with a [SEP] token. Hard negatives are mined with BM25.
- In the ablation, removing the fine-grained pruning step lowers downstream execution accuracy (EX) to 66.2%. The drop is comparable to removing the core retrieval augmentations.
- For the out-of-distribution test, models are trained only on BIRD. The retrieval pool is then expanded with unseen Spider and WikiSQL databases, growing from 0.5K to 20K tables.
- In that test, DBCopilot and ICRL fall to roughly 50% retrieval. Bi-SR keeps Recall@5 above 78% at 20K tables and widens its lead over Gen-SQL as the pool grows.
- Stated limitations:
  - Descriptions may be hallucinated in niche domains the LLM knows poorly.
  - Cell values are not indexed, so value-only disambiguation is weak.

*Our summary of the paper, in our own words — not its text. The work belongs to its authors; read it at the links above.*

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## Cite

Cite as: Yuyang Wu, Xiaoliang Wang and Cam-Tu Nguyen. 2026. Bidirectional Semantic Enhancement for Schema Routing Across Large-Scale Databases. Findings of the Association for Computational Linguistics: ACL 2026.

The paper itself, not this page. BibTeX from the library's record of the work.

```bibtex
@inproceedings{wu2026bidirectional,
  title = {{Bidirectional Semantic Enhancement for Schema Routing Across Large-Scale Databases}},
  author = {Yuyang Wu, Xiaoliang Wang and Cam-Tu Nguyen},
  booktitle = {Findings of the Association for Computational Linguistics: ACL 2026},
  year = {2026},
  doi = {10.18653/v1/2026.findings-acl.369},
  url = {https://doi.org/10.18653/v1/2026.findings-acl.369}
}
```

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*Updated 2 November 2026*