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[Feature] Render a flat RowTypeInfo output schema as JSON Schema #1256
Description
Search before asking
- I searched in the issues and found nothing similar.
Description
@wenjin272 suggested this on #1129.
A RowTypeInfo output schema never gets native structured output today:
- The native connections accept only a POJO class (Java) or a pydantic model (Python), so they skip a
RowTypeInfo. - The prompt path describes the schema with the type's string form (
toString()in Java,str()in Python), not JSON Schema. - The Java
BaseChatModelConnection.chatJavadoc calls the skip a permanent fallback.
Proposal: render a flat RowTypeInfo (basic field types only) as a JSON Schema object, in both languages:
- every field required
additionalProperties: false
Use it in two steps:
- In the prompt, in place of the string form.
- As the native schema, so
AUTOandNATIVEwork for aRowTypeInfo. The connections currently take a class, so this step needs them to accept a schema document as well.
A nested or non-basic RowTypeInfo keeps today's behavior. The guide and the Javadoc above are updated to match.
Are you willing to submit a PR?
- I'm willing to submit a PR!
Activity
weiqingy commentedon Oct 16, 2026
@sangkyoonnam Thanks for taking this. Your two-step split matches the issue. GitHub only lets me assign people who have commented on the issue, so please leave a comment here and I'll assign it to you.
Pointers for the first step:
ReActAgent(Java,outputSchema.toString()) andreact_agent.py(Python,str(output_schema)). The same string feeds both the schema prompt and the native-schema prompt.RowinChatModelAction.generateStructuredOutput(Java) and_generate_structured_output(Python). Both copy the JSON values without converting them to the field types, and a missing field givesnullin Java but aKeyErrorin Python. That can stay out of scope, but a test that checks field types may run into it.For the second step: #1266 moves the six Python
_native_output_modelcopies into one helper, and the native step changes that same check. Whichever lands first, the other can rebase onto it.Happy to review.
sangkyoonnam commentedon Oct 16, 2026
Commenting here so you can assign it to me, @weiqingy. Thanks for the pointers.