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Quantifiers in XQuery

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3 Author(s)
May, N. ; Univ. Mannheim, Germany ; Helmer, S. ; Moerkotte, Guido

We present algebraic equivalences that allow to unnest nested algebraic expressions containing quantifiers for order-preserving algebraic operators. We illustrate how these equivalences can be applied successfully to unnest nested queries formulated in XQuery. Measurements illustrate the performance gains possible by unnesting.

Published in:

Web Information Systems Engineering, 2003. WISE 2003. Proceedings of the Fourth International Conference on

Date of Conference:

10-12 Dec. 2003