langchain/chains/query_constructor/base.py/_get_prompt
def _get_prompt(
    document_contents: str,
    attribute_info: Sequence[AttributeInfo],
    examples: Optional[List] = None,
    allowed_comparators: Optional[Sequence[Comparator]] = None,
    allowed_operators: Optional[Sequence[Operator]] = None,
    enable_limit: bool = False,
) -> BasePromptTemplate:
    attribute_str = _format_attribute_info(attribute_info)
    allowed_comparators = allowed_comparators or list(Comparator)
    allowed_operators = allowed_operators or list(Operator)
    if enable_limit:
        schema = SCHEMA_WITH_LIMIT.format(
            allowed_comparators=" | ".join(allowed_comparators),
            allowed_operators=" | ".join(allowed_operators),
        )

        examples = examples or EXAMPLES_WITH_LIMIT
    else:
        schema = DEFAULT_SCHEMA.format(
            allowed_comparators=" | ".join(allowed_comparators),
            allowed_operators=" | ".join(allowed_operators),
        )

        examples = examples or DEFAULT_EXAMPLES
    prefix = DEFAULT_PREFIX.format(schema=schema)
    suffix = DEFAULT_SUFFIX.format(
        i=len(examples) + 1, content=document_contents, attributes=attribute_str
    )
    output_parser = StructuredQueryOutputParser.from_components(
        allowed_comparators=allowed_comparators, allowed_operators=allowed_operators
    )
    return FewShotPromptTemplate(
        examples=examples,
        example_prompt=EXAMPLE_PROMPT,
        input_variables=["query"],
        suffix=suffix,
        prefix=prefix,
        output_parser=output_parser,
    )