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Multiple-stage evaluation of user-defined predicates

  • US 6,192,358 B1
  • Filed: 07/09/1998
  • Issued: 02/20/2001
  • Est. Priority Date: 07/10/1997
  • Status: Expired due to Term
First Claim
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1. A method of executing a statement in a database stored on a data storage device connected to a computer, the method comprising the steps of:

  • receiving the statement, wherein the statement contains a user-defined predicate with a user-defined function; and

    performing multiple-stage evaluation of the user-defined predicate wherein at least one stage comprises performing index exploitation as specified in the user-defined function.

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