Guy M. Lohman and Laura M. Haas. Personal correspondence, November 1993. Home/Search Document Not in Database Summary Related Articles |
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Practical Predicate Placement - Hellerstein (1994) (28 citations) (Correct)
....and cost was discussed, but in the final implementation subqueries were ordered among themselves by a cost only metric: the more difficult the subquery was to compute, the later it would be applied. Neither system considered pulling up subquery predicates from their lowest eligible position. LH93] An orthogonal issue related to predicate placement is the problem of rewriting predicates into more efficient forms [CS93, CYY 92] In such semantic optimization work, the focus is on rewriting expensive predicates in terms of other, cheaper predicates. This is similar to the query rewrite ....
Guy M. Lohman and Laura M. Haas. Personal correspondence, November 1993.
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