OFL: a functional execution model for object query languages

  • Authors:

  • Georges Gardarin;Fernando Machuca;Philippe Pucheral

  • Affiliations:

  • PRISM Laboratory, University of Versailles/Saint-Quentin, 45, Avenue des Etats-Unis, 78035 VERSAILLES Cedex, France and Projet Rodin, INRIA, Rocquencourt, France;PRISM Laboratory, University of Versailles/Saint-Quentin, 45, Avenue des Etats-Unis, 78035 VERSAILLES Cedex, France and EDS International (France) SA, Guillaumet, 060 Avenue du président Wils ...;PRISM Laboratory, University of Versailles/Saint-Quentin, 45, Avenue des Etats-Unis, 78035 VERSAILLES Cedex, France

  • Venue:
  • SIGMOD '95 Proceedings of the 1995 ACM SIGMOD international conference on Management of data
  • Year:
  • 1995

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Abstract

We present a functional paradigm for querying efficiently abstract collections of complex objects. Abstract collections are used to model class extents, multivalued attributes as well as indexes or hashing tables. Our paradigm includes a functional language called OFL (Object Functional Language) and a supporting execution model based on graph traversals. OFL is able to support any complex object algebra with recursion as macros. It is an appropriate target language for OQL-like query compilers. The execution model provides various strategies including set-oriented and pipelined traversals. OFL has been implemented on top of an object manager. Measures of a typical query extracted from a geographical benchmark show the value of hybrid strategies integrating pipelined and set-oriented evaluations. They also show the potential of function result memorization, a typical optimization approach known as "Memoization" 2 in functional languages.