GTR: Graph-Table-RAG for Cross-Table Question Answering

• URL: http://arxiv.org/abs/2504.01346v2
• Date: Thu, 03 Apr 2025 02:15:30 GMT
• Title: GTR: Graph-Table-RAG for Cross-Table Question Answering
• Authors: Jiaru Zou, Dongqi Fu, Sirui Chen, Xinrui He, Zihao Li, Yada Zhu, Jiawei Han, Jingrui He,
• Abstract summary: We propose the first Graph-Table-RAG framework, namely GTR, which reorganizes table corpora into a heterogeneous graph.<n> GTR exhibits superior cross-table question-answering performance while maintaining high deployment efficiency, demonstrating its real-world practical applicability.
• Score: 53.11230952572134
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Beyond pure text, a substantial amount of knowledge is stored in tables. In real-world scenarios, user questions often require retrieving answers that are distributed across multiple tables. GraphRAG has recently attracted much attention for enhancing LLMs' reasoning capabilities by organizing external knowledge to address ad-hoc and complex questions, exemplifying a promising direction for cross-table question answering. In this paper, to address the current gap in available data, we first introduce a multi-table benchmark, MutliTableQA, comprising 60k tables and 25k user queries collected from real-world sources. Then, we propose the first Graph-Table-RAG framework, namely GTR, which reorganizes table corpora into a heterogeneous graph, employs a hierarchical coarse-to-fine retrieval process to extract the most relevant tables, and integrates graph-aware prompting for downstream LLMs' tabular reasoning. Extensive experiments show that GTR exhibits superior cross-table question-answering performance while maintaining high deployment efficiency, demonstrating its real-world practical applicability.

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