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arxiv: 2605.00628 · v1 · submitted 2026-05-01 · 💻 cs.DB · cs.CL

Recognition: unknown

EGREFINE: An Execution-Grounded Optimization Framework for Text-to-SQL Schema Refinement

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Pith reviewed 2026-05-09 18:57 UTC · model grok-4.3

classification 💻 cs.DB cs.CL
keywords Text-to-SQLschema refinementexecution feedbackconstrained optimizationdatabase viewsambiguous namingquery equivalence
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The pith

EGRefine recovers Text-to-SQL accuracy lost to ambiguous schema names by treating refinement as constrained optimization solved via greedy execution-verified renamings materialized as views.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper frames schema refinement for Text-to-SQL as a constrained optimization problem of finding column renamings that maximize execution accuracy while preserving query equivalence through database views. It solves the problem with a four-phase pipeline that screens ambiguous columns, generates context-aware candidate names, verifies changes using execution feedback on sample queries, and outputs non-destructive views. A sympathetic reader would care because real-world databases frequently use abbreviated or inconsistent names that degrade model performance, and this method offers an automated, safe way to improve results without altering the original data or retraining models. The approach also demonstrates that refined schemas transfer across different model families.

Core claim

EGRefine solves the schema refinement problem by decomposing the constrained optimization into a column-wise greedy process, generating candidates, applying conservative verification through execution-grounded feedback to enforce column-local non-degradation, and materializing results as views to guarantee database-level query equivalence. This construction ensures safety at the column level while handling cross-column interactions empirically. The result is recovery of accuracy on naming-degraded schemas where the task fits current Text-to-SQL capabilities, correct abstention otherwise, and transfer of refined schemas across model families.

What carries the argument

The column-wise greedy decomposition of the constrained optimization problem for renaming, paired with conservative execution verification on sample queries to select only non-degrading candidates.

Load-bearing premise

That column-wise greedy selection of renamings, verified only on a finite set of queries, will not miss globally superior combinations or allow degradation on unseen queries.

What would settle it

An experiment that exhaustively searches renamings on a small schema and shows a non-greedy combination yields higher accuracy than the greedy output, or a test showing accuracy drop on queries held out from the verification set after applying the refined views.

Figures

Figures reproduced from arXiv: 2605.00628 by Jiaqian Wang, Rui Yang, Wenjin Hou, Yu Pang, Yutao Qi.

Figure 1
Figure 1. Figure 1: Overview of the EGREFINE pipeline. Given a raw schema S (left, with example tables employee, department, salary), the four phases progressively refine column names and output a refined schema S ′ as a non-destructive view layer (right). Phase 1 (LLM-Based Screening, §IV-A) selects n ≪ m candidate columns whose names may impede Text-to￾SQL interpretation, using full-schema LLM judgment rather than surface-l… view at source ↗
Figure 2
Figure 2. Figure 2: Cross-model results on Dr.Spider Schema-Abbreviation view at source ↗
Figure 4
Figure 4. Figure 4: Phase 3 overrides LLM’s top-1 candidate in 60–80% view at source ↗
Figure 5
Figure 5. Figure 5: Query-level C→W vs W→C flips across 30 configura￾tions: 18 EGREFINE (incl. 6 BIRD+evidence variants) and 12 LLM-Direct. EGREFINE clusters in the upper-left net-repair region (15/18 with ratio >1, max 6.46:1); LLM-Direct scatters and includes severe failures below the diagonal (worst DIN￾SQL point 0.69:1, worst overall 0.68:1 on MAC-SQL). the same (benchmark, backbone, algorithm) cell, EGRefine breaks fewer… view at source ↗
read the original abstract

Text-to-SQL enables non-expert users to query databases in natural language, yet real-world schemas often suffer from ambiguous, abbreviated, or inconsistent naming conventions that degrade model accuracy. Existing approaches treat schemas as fixed and address errors downstream. In this paper, we frame schema refinement as a constrained optimization problem: find a renaming function that maximizes downstream Text-to-SQL execution accuracy while preserving query equivalence through database views. We analyze the computational hardness of this problem, which motivates a column-wise greedy decomposition, and instantiate it as EGRefine: a four-phase pipeline that screens ambiguous columns, generates context-aware candidate names, verifies them through execution-grounded feedback, and materializes the result as non-destructive SQL views. The pipeline carries two structural properties: column-local non-degradation, ensured by the conservative selection rule in the verification phase, and database-level query equivalence, ensured by the view-based materialization phase. Together they make the resulting refinement safe by construction at the column level, with cross-column and prompt-level interactions handled empirically rather than analytically. Across controlled schema-degradation, real-world, and enterprise benchmarks, EGRefine recovers accuracy lost to schema naming noise where applicable and correctly abstains where the underlying task exceeds current Text-to-SQL capabilities, with refined schemas transferring across model families to enable refine-once, serve-many-models deployment. Code and data are publicly available at https://github.com/ai-jiaqian/EGRefine.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The paper frames Text-to-SQL schema refinement as a constrained optimization problem of finding renamings that maximize execution accuracy while preserving equivalence via views. It provides a hardness analysis motivating a column-wise greedy decomposition, then instantiates EGRefine as a four-phase pipeline (screen ambiguous columns, generate context-aware candidates, verify via execution feedback, materialize as views). The pipeline is claimed to ensure column-local non-degradation by construction and database-level equivalence, with empirical results on controlled degradation, real-world, and enterprise benchmarks showing accuracy recovery where applicable, correct abstention otherwise, and transfer across model families.

Significance. If the empirical recovery and transfer results hold under the stated controls, the work offers a practical, model-agnostic way to mitigate naming-induced errors in Text-to-SQL without retraining or altering downstream systems. The public code and data release is a clear strength that supports reproducibility. The structural safety properties (local non-degradation and view equivalence) are attractive if they survive broader validation.

major comments (2)
  1. [Abstract and §4] Abstract and §4 (pipeline description): the central claim of safe refinement rests on the conservative verification rule ensuring column-local non-degradation, yet the paper provides no formal argument or additional experiments showing that execution feedback on a finite query set suffices to prevent degradation on unseen queries or under prompt variations across model families.
  2. [Abstract and hardness analysis section] Abstract and hardness analysis section: the column-wise greedy decomposition is motivated by computational hardness, but no approximation guarantee, exhaustive-search baseline on small instances, or comparison to joint optimization is reported; this leaves open whether locally optimal per-column choices sacrifice globally superior renamings that could further improve accuracy.
minor comments (2)
  1. [Abstract] The abstract states that cross-column and prompt-level interactions are handled empirically; a dedicated limitations or future-work paragraph would help readers assess the scope of this empirical handling.
  2. [Experimental section] Table or figure captions for the benchmark results should explicitly list the exact query sets, number of queries per benchmark, and the models used for verification to allow direct replication.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive feedback on our manuscript. We address each major comment below with point-by-point responses and indicate where revisions will be made to improve clarity and rigor.

read point-by-point responses
  1. Referee: [Abstract and §4] Abstract and §4 (pipeline description): the central claim of safe refinement rests on the conservative verification rule ensuring column-local non-degradation, yet the paper provides no formal argument or additional experiments showing that execution feedback on a finite query set suffices to prevent degradation on unseen queries or under prompt variations across model families.

    Authors: We agree that the manuscript does not provide a formal proof that execution feedback on a finite query set guarantees non-degradation for arbitrary unseen queries or all prompt variations. The conservative verification rule ensures column-local non-degradation by construction only for the queries used in verification, while generalization across columns, models, and prompts is handled empirically as stated in the abstract. Our benchmarks include transfer results across model families and real-world/enterprise sets, but we acknowledge this falls short of exhaustive validation. We will revise §4 to explicitly bound the safety claim to the verification set, add a limitations discussion, and include new experiments on held-out queries and prompt variations. revision: yes

  2. Referee: [Abstract and hardness analysis section] Abstract and hardness analysis section: the column-wise greedy decomposition is motivated by computational hardness, but no approximation guarantee, exhaustive-search baseline on small instances, or comparison to joint optimization is reported; this leaves open whether locally optimal per-column choices sacrifice globally superior renamings that could further improve accuracy.

    Authors: The hardness analysis establishes NP-hardness of the joint problem, which motivates the scalable column-wise greedy decomposition. We acknowledge that no approximation ratio, exhaustive baseline on small instances, or joint-optimization comparison is provided, leaving open the possibility of superior global solutions. Joint optimization is impractical for realistic schema sizes due to combinatorial explosion. We will revise the hardness section to include exhaustive-search results on small synthetic instances (3-5 columns) quantifying the greedy-to-optimal gap and add discussion of the decomposition's trade-offs. revision: yes

Circularity Check

0 steps flagged

No significant circularity; derivation relies on external execution feedback and view materialization.

full rationale

The paper frames schema refinement as a constrained optimization problem whose objective is downstream Text-to-SQL execution accuracy measured on actual runs, which is external to the renaming function. Hardness analysis motivates the column-wise greedy decomposition without defining the objective in terms of itself. The verification phase applies a conservative selection rule using execution feedback on a finite query set, and materialization ensures equivalence via non-destructive views; these properties are enforced by construction through the described rules rather than by fitting or self-referential definition. No load-bearing self-citations, imported uniqueness theorems, or ansatzes appear in the derivation chain, and the approach remains self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The approach rests on domain assumptions about query equivalence via views and the effectiveness of greedy search for the renaming problem; no free parameters or invented entities are explicitly introduced in the abstract.

axioms (2)
  • domain assumption Creating database views that alias renamed columns to originals preserves query equivalence.
    Invoked in the materialization phase to ensure safety.
  • ad hoc to paper Column-wise greedy decomposition is a viable approximation to the global constrained optimization problem.
    Motivated by the stated computational hardness analysis.

pith-pipeline@v0.9.0 · 5566 in / 1548 out tokens · 74549 ms · 2026-05-09T18:57:05.929126+00:00 · methodology

discussion (0)

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