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:
Mar. 18, 2014
Filed:
May. 20, 2008
Wei Han, Beaverton, OR (US);
Lin Qiao, San Jose, CA (US);
Vijayshankar Raman, Sunnyvale, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A query processing method intersects two or more unsorted lists based on a conjunction of predicates. Each list comprises a union of multiple sorted segments. The method performs lazy segment merging and an adaptive n-ary intersecting process. The lazy segment merging comprises starting with each list being a union of completely unmerged segments, such that lookups into a given list involve separate lookups into each segment of the given list. The method intersects the lists according to the predicates while performing the lazy segment merging, such that the lazy segment merging reads in only those portions of each segment that are needed for the intersecting. As the intersecting proceeds and the lookups are performed, the intersecting selectively merges the segments together, based on a cost-benefit analysis of the cost of merging compared to the benefit produced by reducing a number of lookups.