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:
May. 05, 2020
Filed:
Feb. 20, 2018
Tableau Software, Inc., Seattle, WA (US);
Daniel Ting, Seattle, WA (US);
Tableau Software, Inc., Seattle, WA (US);
Abstract
A process creates a data sketch for a data set with many rows. A user selects data fields from the data source. The process allocates storage for N bins, where each bin has storage space for a key value and an associated counter value (which is initialized to zero). The process sequentially accesses the rows from the data source (e.g., as a stream). For each row, the process computes a respective key value using data values for the selected data fields. When the respective key value matches a key value for a respective bin, the process increments the counter value for the respective bin. Otherwise, the process identifies a respective bin with a smallest counter value c. The process increments the counter value of the respective bin, and with probability 1/(1+c), replaces the key value of the respective bin with the respective key value.