Implement ANSI/ISO Sequence Generators For Apache Derby

by Suran Jayathilaka for The Apache Software Foundation

This project will add support for ANSI/ISO compliant sequence generators to the Apache Derby RDBMS with the following features. 1. Creating/dropping a Sequence generators with optional clauses 2. Granting and revoking permissions to users or roles to use a sequence generator 3. Invoking a sequence generator 4. Altering an existing sequence generator Also two new system catalogs to store sequence descriptions and usage permission records will be added, along with upgrade logic for older databases.