[Bug]: rag_handler pydantic validation errors

[dusvyat]

Short description of current behavior

DROP ML_ENGINE IF EXISTS rag_engine;
CREATE ML_ENGINE rag_engine
FROM rag
USING
    openai_api_key = 'our open api key';

DROP MODEL mindsdb_rag_model;
CREATE MODEL mindsdb_rag_model
predict answer
USING
   engine = "rag_engine",
   llm_type = "openai",
   url='https://docs.mindsdb.com/what-is-mindsdb',
   vector_store_folder_name = 'db_connection',
   input_column = 'question'; 

DESCRIBE mindsdb_rag_model;
SELECT *
FROM mindsdb_rag_model
WHERE question = 'What ML use cases does MindsDB support?';

We are getting the following error :

mindsdb.integrations.libs.ml_exec_base.MLEngineException: [rag_engine/mindsdb_rag_model]: TypeError: 'pydantic_core._pydantic_core.ValidationInfo' object is not subscriptable

Video or screenshots

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Expected behavior

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How to reproduce the error

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Anything else?

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