Transforming a scalar subquery
US10733188B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 2019 |
| Grant date | Aug 4, 2020 |
| Priority date | — |
| Expiry date | Jul 16, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F16/2456
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for transforming a scalar sub-query to join with non-provable singleton output, responsive to receiving a parsed representation of a statement, containing a scalar operation, which is correlated to predetermined types of objects, by analyzing the parsed representation to determine eligibility for transformation of any scalar operations. Responsive to a determination of eligibility, a query engine injects additional processing into the parsed representation to defer checking of a 1 row condition required by statement semantics. The query engine further injects processing to utilize a result of the additional processing to validate a single row is produced for each GROUPING/PARTITION key. The parsed representation is modified to remove the 1 row condition. The query engine decorrelates the parsed representation using a predetermined method absent a requirement for a unique key to be present in a predicate of the scalar operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.