Abstract
This paper distinguishes among three kinds of linear recursions: canonical strongly linear recursion (CSLR), non-interdependent linear recursion (NILR) and interdependent linear recurstion (ILR) and presents an optimal algorithm for each. First, for the CSLRs, the magic-set method is refined in such a way that queries can be evaluated efficiently. Then, for the NILRs and ILRs, the concept of query dependency graphs is introduced to partition the rules of a program into a set of CSLRs and the computation is elaborated so that the oplimization for CSLRs can also be applied.
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Chen Yangjun received his B.S. degree in information system engineering from the Technical Institute of Changsha, China, in 1982, and his Diploma and Ph.D. degrees in computer science from the University of Kaiserslautern, Germany, in 1990 and 1995, respectively. Dr. Chen is currently an Assistant Professor of the Technical University of Chemnitz-Zwickau, Germany. His research interests include deductive databases, federative databases, constraint satisfaction problem, graph theory and combinatorics. He has about 30 publications in these areas.
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Chen, Y. Magic sets revisited. J. of Comput. Sci. & Technol. 12, 346–365 (1997). https://doi.org/10.1007/BF02943154
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DOI: https://doi.org/10.1007/BF02943154