Experimental JSON_SCHEMA

[lmangani]

JSON Structured Output (very experimental)

Define a json_schema to receive a structured response in JSON format... most of the time.

{
    summary: 'VARCHAR',
    favourite_animals:='VARCHAR[]',
    favourite_activity:='VARCHAR[]',
    star_rating:='INTEGER'},
    struct_descr:={star_rating: 'rating on a scale from 1 (bad) to 5 (very good)'
}

Prompt based. Output depends on model skills.

D SET VARIABLE openprompt_model_name = 'qwen2.5:1.5b';
D SET VARIABLE openprompt_json_schema = "struct:={summary: 'VARCHAR', favourite_animals:='VARCHAR[]', favourite_activity:='VARCHAR[]', star_rating:='INTEGER'}, struct_descr:={star_rating: 'visit rating on a scale from 1 (bad) to 5 (very good)'}";
D SELECT open_prompt('My zoo visit was fun and I loved the bears and tigers. i also had icecream') AS response;
┌─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│                                                                        response                                                                         │
│                                                                         varchar                                                                         │
├─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ {"summary": "A short summary of your recent zoo visit activity.", "favourite_animals": ["bears", "tigers"], "favourite_activity": ["icecream"], "sta …  │
└─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘

The results can be validated and parsed with the DuckDB JSON extension and its functions

D LOAD json;                                      ^
D WITH response AS (SELECT open_prompt('My zoo visit was fun and I loved the bears and tigers. i also had icecream') AS response) SELECT json_structure(response) FROM response;
┌────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│                                          json_structure(response)                                          │
│                                                    json                                                    │
├────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ {"summary":"VARCHAR","favourite_animals":"VARCHAR","favourite_activity":"VARCHAR","star_rating":"UBIGINT"} │
└────────────────────────────────────────────────────────────────────────────────────────────────────────────┘