Systems and methods for updating a query engine opcode tree
US7539691B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 2004 |
| Grant date | May 26, 2009 |
| Priority date | — |
| Expiry date | Feb 12, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S707/99943
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Implementations described herein relate to using a filter engine opcode tree for evaluating multiple queries. The opcode tree includes opcode nodes and branch nodes. Each opcode node includes one or more computer instructions resulting from compiling a query. Executing the opcode tree a single time evaluates each of multiple queries represented in the opcode tree. When a new opcode node is added to the tree, the context of the opcode tree and the structure of the new opcode are taken into account when modifying a branch node or an opcode node. In certain situation, a branch node is optimized to include an indexed lookup function such as a hash function, to optimize processing of opcode nodes that depend from the branch node. Adding and removing nodes to/from the opcode tree can be handled by a filter engine component or by an opcode object being added to/removed from the tree.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.