KuaiSearch: An E-Commerce Search Dataset with Authentic Queries and Product Texts for Recall, Ranking, and Relevance

E-commerce search connects user needs with massive product inventories, yet real-world systems face challenges from ambiguous queries, noisy product texts, and diverse user preferences. Recent advances in large language models (LLMs) offer new opportunities for semantic understanding and intent modeling, but existing e-commerce search datasets remain limited by heuristically constructed queries, popularity-based filtering, anonymized texts, and incomplete coverage of the search pipeline. These limitations hinder realistic evaluation of LLM-based e-commerce search. To address this gap, we introduce KuaiSearch, a large-scale dataset built from real user search interactions on the Kuaishou platform. KuaiSearch preserves authentic queries and natural-language product texts, retains cold-start users and long-tail products, and covers three key stages of the search pipeline: recall, ranking, and relevance judgment. We further provide comprehensive analyses of users, products, and queries, together with benchmark experiments on representative search tasks. Results demonstrate the value of KuaiSearch as a realistic benchmark for e-commerce search research. The code is available at https://anonymous.4open.science/r/KuaiSearch-7230/.