The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 10, 2008
Filed:
Nov. 08, 2004
James W. Warner, Mountain View, CA (US);
Zhen Hua Liu, San Mateo, CA (US);
Muralidhar Krishnaprasad, Fremont, CA (US);
Anand Manikutty, Foster City, CA (US);
Rohan Angrish, Redwood City, CA (US);
Vikas Arora, San Francisco, CA (US);
Susan M. Kotsovolos, San Carlos, CA (US);
James W. Warner, Mountain View, CA (US);
Zhen Hua Liu, San Mateo, CA (US);
Muralidhar Krishnaprasad, Fremont, CA (US);
Anand Manikutty, Foster City, CA (US);
Rohan Angrish, Redwood City, CA (US);
Vikas Arora, San Francisco, CA (US);
Susan M. Kotsovolos, San Carlos, CA (US);
Oracle International Corporation, Redwood Shores, CA (US);
Abstract
Techniques are described for executing queries that have XPath sections that specify unmappable paths. The techniques involve splitting the unmappable paths into (1) a mappable path fragment, and (2) an unmappable path fragment. After an unmappable path has been split into a mappable path fragment and an unmappable path fragment, the XPath section is replaced with a replacement XPath section. The replacement XPath section specifies two operations: a 'mappable operation' that is based on the mappable path fragment, and an 'unmappable operation' that is based on the unmappable path fragment. The portion of the replacement XPath section that specifies the mappable operation is rewritten to access underlying relational structures. Consequently, when the rewritten query is executed, a smaller amount of XML data needs to be materialized to evaluate the unmappable path fragment than would otherwise have been required to evaluate the original unmappable path.