File size: 2,591 Bytes
942050b | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 | """Node: re-ask the LLM for SQL given the previous failure context.
Per arch v2 §3, exactly one repair pass per question. The graph guards this
by checking ``state["repair_attempted"]`` before routing here. This node
sets the flag itself before returning so a second routing attempt would be
a programming error in the graph.
"""
from __future__ import annotations
from collections.abc import Callable
from nl_sql.agent.nodes._support import (
parse_generate_sql_output,
render_schema_block,
)
from nl_sql.agent.prompts import load_prompt
from nl_sql.agent.state import PipelineState
from nl_sql.llm.providers.base import GenerateRequest, LLMProvider
def make_repair_once_node(
provider: LLMProvider,
*,
max_tokens: int = 1024,
temperature: float = 0.0,
sort_schema_block: bool = False,
) -> Callable[[PipelineState], PipelineState]:
def node(state: PipelineState) -> PipelineState:
generated = state.get("generated")
previous_sql = generated.sql if generated else ""
error_context = state.get("last_error") or "(no error context — likely a programming bug)"
question = state.get("question", "")
dialect = state.get("dialect", "sqlite")
context = state.get("context")
plan_raw = (state.get("plan") or "").strip()
plan_block = plan_raw if plan_raw else "(no plan — repair SQL directly)"
prompt = load_prompt(
"repair_sql",
dialect=dialect,
schema_block=render_schema_block(context, sort_alphabetically=sort_schema_block),
question=question,
previous_sql=previous_sql,
error_context=error_context,
plan_block=plan_block,
)
response = provider.generate(
GenerateRequest(prompt=prompt, max_tokens=max_tokens, temperature=temperature)
)
parsed = parse_generate_sql_output(response.text)
trace = list(state.get("trace") or [])
trace.append(
{
"node": "repair_once",
"model": response.model,
"confidence": parsed.confidence,
"previous_error": error_context,
"input_tokens": response.input_tokens,
"output_tokens": response.output_tokens,
}
)
return {
"generated": parsed,
"outcome": None,
"repair_attempted": True,
"last_error": "",
"error_kind": None,
"error_message": "",
"trace": trace,
}
return node
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