Quantifiers in XQuery

  • Authors:

  • Norman May;Sven Helmer;Guido Moerkotte

  • Affiliations:

  • -;-;-

  • Venue:
  • WISE '03 Proceedings of the Fourth International Conference on Web Information Systems Engineering
  • Year:
  • 2003

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Abstract

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.