Patents by Inventor Chengzhu Zhang

Chengzhu Zhang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Selectivity computation for filtering based on metadata
    Patent number: 11782925
    Abstract: In some examples, the database system maintains metadata for a plurality of data objects, the metadata containing ranges of values of an attribute for the plurality of data objects, where the ranges of values of the attribute comprise a respective range of values of the attribute for each corresponding data object of the plurality of data objects. The database system generates a data structure tracking quantities of ranges of values of the attribute that have a specified relationship with respect to corresponding different values of the attribute. The database system receives a database query comprising a predicate specifying a condition on a given value of the attribute, and computes, for the database query, a selectivity of filtering based on the metadata, the selectivity computed based on the data structure.
    Type: Grant
    Filed: December 23, 2020
    Date of Patent: October 10, 2023
    Assignee: Teradata US, Inc.
    Inventors: Mohamed Ahmed Yassin Eltabakh, Eugene Szedenits, Jr., Chengzhu Zhang, Mohammed Al-Kateb
  • SELECTIVITY COMPUTATION FOR FILTERING BASED ON METADATA
    Publication number: 20220197908
    Abstract: In some examples, the database system maintains metadata for a plurality of data objects, the metadata containing ranges of values of an attribute for the plurality of data objects, where the ranges of values of the attribute comprise a respective range of values of the attribute for each corresponding data object of the plurality of data objects. The database system generates a data structure tracking quantities of ranges of values of the attribute that have a specified relationship with respect to corresponding different values of the attribute. The database system receives a database query comprising a predicate specifying a condition on a given value of the attribute, and computes, for the database query, a selectivity of filtering based on the metadata, the selectivity computed based on the data structure.
    Type: Application
    Filed: December 23, 2020
    Publication date: June 23, 2022
    Inventors: Mohamed Ahmed Yassin Eltabakh, Eugene Szedenits, JR., Chengzhu Zhang, Mohammed Al-Kateb