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- W2998446626 abstract "We determine when a join/outerjoin query can be expressed unambiguously as a query graph, without an explicit specification of the order of evaluation. To do so, we first characterize the set of expression trees that implement a given join/outerjoin query graph, and investigate the existence of transformations among the various trees. Our main theorem is that a join/outerjoin query is freely reorderable if the query graph derived from it falls within a particular class, every tree that “implements” such a graph evaluates to the same result. The result has applications to language design and query optimization. Languages that generate queries within such a class do not require the user to indicate priority among join operations, and hence may present a simplified syntax. And it is unnecessary to add extensive analyses to a conventional query optimizer in order to generate legal reorderings for a freely-reorderable language." @default.
- W2998446626 created "2020-01-10" @default.
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- W2998446626 date "1990-05-01" @default.
- W2998446626 modified "2023-10-11" @default.
- W2998446626 title "Query graphs, implementing trees, and freely-reorderable outerjoins" @default.
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- W2998446626 doi "https://doi.org/10.1145/93605.98738" @default.
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