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. 09, 2020
Filed:
May. 22, 2017
Oracle International Corporation, Redwood Shores, CA (US);
Shasank K. Chavan, Menlo Park, CA (US);
Dina Thomas, Palo Alto, CA (US);
Ajit Mylavarapu, Mountain View, CA (US);
Prashant Gaharwar, San Mateo, CA (US);
Tirthankar Lahiri, Palo Alto, CA (US);
Jesse Kamp, Castro Valley, CA (US);
Oracle International Corporation, Redwood Shores, CA (US);
Abstract
Techniques are described for encoding join columns that belong to the same domain with a common dictionary. The tables are encoded with dictionary indexes that make the comparison operation of a join query a quick equality check of two integers and there is no need to compute any hashes during execution. Additionally, the techniques described herein minimize the bloom filter creation and evaluation cost as well because the dictionary indexes serve as hash values into the bloom filter. If the bloom filter is as large as the range of dictionary indexes, then the filter is no longer a probabilistic structure and can be used to filter rows in the probe phase with full certainty without any significant overhead.