Challenge: Existing automated metrics for long-form table question answering (LFTQA) are poorly correlated with human judgments and fail to distinguish between factually accurate responses and those that are factual incorrect.
Approach: They propose to use a meta-evaluation dataset to assess the effectiveness of LLM-based LFTQA systems.
Outcome: The proposed meta-evaluation dataset includes 2,988 human-annotated examples.

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A Critical Evaluation of Evaluations for Long-form Question Answering (2023.acl-long)

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Challenge: Long-form question answering (LFQA) is an emerging research area within QA . however, its flexibility poses enormous challenges for evaluation .
Approach: They conduct the first targeted study of the evaluation of long-form answers, covering both human and automatic evaluation practices.
Outcome: The proposed evaluations cover human and automatic evaluations.
Table Question Answering in the Era of Large Language Models: A Comprehensive Survey of Tasks, Methods, and Evaluation (2026.acl-long)

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Challenge: Table Question Answering (TQA) aims to answer natural language questions using tabular data.
Approach: They propose a systematic overview of TQA research using large language models and summarize available benchmarks based on task features.
Outcome: The proposed framework provides a comprehensive overview of the current state of the art in the field of Table Question Answering.
PEDANTS: Cheap but Effective and Interpretable Answer Equivalence (2024.findings-emnlp)

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Challenge: Current short-form QA evaluations lack diverse styles of evaluation data and rely on expensive and slow LLMs.
Approach: They propose a rubric for machine QA that is more stable than an exact match and neural methods.
Outcome: The proposed evaluations improve on the existing short-form QA evaluations using the Trivia community.
TableEval: A Real-World Benchmark for Complex, Multilingual, and Multi-Structured Table Question Answering (2025.emnlp-main)

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Challenge: Existing TableQA benchmarks focus on simple flat tables and suffer from data leakage . current benchmarks are monolingual and fail to capture cross-lingual variability .
Approach: They propose a table-based TableQA benchmark to evaluate LLMs on real-world tasks.
Outcome: The proposed benchmarks show that they achieve high agreement with human judgment . the proposed framework improves on the alignment between model responses and reference answers .
On Evaluating the Integration of Reasoning and Action in LLM Agents with Database Question Answering (2024.findings-naacl)

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Challenge: a new study evaluates how Large Language Models interact with a SQL interpreter . the model is limited in context and is stochastic, making it less suited for tasks requiring high precision and extensive computations.
Approach: They propose and evaluate two interaction strategies to evaluate how LLMs interact with a SQL interpreter.
Outcome: The proposed framework improves the accuracy and reliability of the evaluations.
ELI5: Long Form Question Answering (P19-1)

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Challenge: Existing question answering datasets provide extractive or short answers, but less attention has been paid to open-ended questions that require explanations.
Approach: They present a large-scale corpus for long form question answering . they use a Reddit forum to provide elaborate answers to open-ended questions .
Outcome: The proposed model outperforms Seq2Seq, language modeling, and other models in human evaluations.
Question Answering over Tabular Data with DataBench: A Large-Scale Empirical Evaluation of LLMs (2024.lrec-main)

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Challenge: Large Language Models (LLMs) are showing emerging abilities, but they are not large enough to assess their capabilities.
Approach: They propose a benchmark that compares large language models with open and closed source models.
Outcome: The proposed benchmark compares open and closed-source models with open-source and closed source models.
Hurdles to Progress in Long-form Question Answering (2021.naacl-main)

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Challenge: Long-form question answering (LFQA) involves retrieving documents relevant to a given question and using them to generate a paragraph-length answer.
Approach: They propose a long-form question answering system that relies on sparse attention and contrastive retriever learning to achieve state-of-the-art performance on the ELI5 LFQA dataset.
Outcome: The proposed system tops the public leaderboard on the ELI5 LFQA dataset, but it has several troubling issues.
DebateQA: Evaluating Question Answering on Debatable Knowledge (2026.findings-eacl)

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Challenge: Existing QA benchmarks that provide fixed answers to debatable questions are inadequate for evaluating their performance.
Approach: They propose to use a dataset of 2,941 debatable questions to assess their ability to provide comprehensive answers to inherently debatably asked questions.
Outcome: The proposed model performs well on 2,941 debatable questions accompanied by human-annotated partial answers that capture a variety of perspectives.
FinLFQA: Evaluating Attributed Text Generation of LLMs in Financial Long-Form Question Answering (2025.findings-emnlp)

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Challenge: Existing benchmarks focus on simple attribution that retrieves textual evidence as references.
Approach: They propose a benchmark to evaluate the ability of large language models to generate reliable attributions.
Outcome: The proposed benchmark evaluates the ability of LLMs to generate long-form answers with reliable and nuanced attributions.

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