Default no-op LLM fallback implementation. Always returns null (no LLM available). Replace with a real implementation to enable LLM-based SQL fix-up.
Attempt to fix a failed SQL conversion using an LLM.
The LLM-corrected SQL, or null if unable to fix
Default no-op LLM fallback implementation. Always returns null (no LLM available). Replace with a real implementation to enable LLM-based SQL fix-up.