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An erroneous fact concerning the assumption of irreducibility of nonjoining attributes of the distributed query optimization algorithm called GENERAL presented in the above paper (see ibid., vol.SE-9, no.1, p.57-68, Jan. 1983) is pointed out. It is shown that it is possible to generate an efficient semijoin program with better response time than the one produced by the GENERAL algorithm. A counterexample that proves this possibility is provided.
Date of Publication: Apr 1988