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T. Y. Cliff Leung
Researcher at IBM
Publications - 3
Citations - 157
T. Y. Cliff Leung is an academic researcher from IBM. The author has contributed to research in topics: Query optimization & Rewriting. The author has an hindex of 3, co-authored 3 publications receiving 155 citations.
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Proceedings ArticleDOI
Cost-based optimization for magic: algebra and implementation
Praveen Seshadri,Joseph M. Hellerstein,Hamid Pirahesh,T. Y. Cliff Leung,Raghu Ramakrishnan,Divesh Srivastava,Peter J. Stuckey,Sundararajarao Sudarshan +7 more
TL;DR: A practical scheme that models magic sets rewriting as a special join method that can be added to any cost-based query optimizer, and a formal algebraic model based on an extension of the multiset relational algebra, which cleanly defines the search space and can be used in a rule-based optimizer.
Book ChapterDOI
Querying Historical Data in IBM DB2 C/S DBMS Using Recursive SQL
T. Y. Cliff Leung,Hamid Pirahesh +1 more
TL;DR: This paper shows to what extent existing features of a commercial DBMS, such as DB2, can be used to provide some advanced supports for time-varying data.