Part 7/12:

• Semantic Layer & Business Rules: The system uses a semantic layer to interpret domain-specific terms like "abnormal blood pressure," ensuring requests are contextually meaningful.

Advanced Techniques for SQL Generation and Data Filtering

Handling noisy or high-cardinality categorical data posed significant hurdles. The solution involved:

• Schema Embeddings: Fine-tuned embeddings capture schema semantics, stored in a vector database for rapid semantic similarity searches.

• Two-Stage Filtering: Combined locality-sensitive hashing (LSH) for indexing categorical values with traditional semantic matching, reducing candidate tables and columns drastically.