[CAY-1162] SelectDescriptor concept

• Type: Task
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 3.0M5
• Fix Version/s: 3.0
• Component/s: Core Library
• Assignee: Andrus Adamchik
• Reporter: Andrus Adamchik
• Created: 25/Dec/08 14:21
• Updated: 22/Oct/09 07:58
• Resolved: 22/Oct/09 07:58

Description

The goal is to create an abstract SelectDescriptor interface that would define what columns a select query contains and how to read them from result set. SelectDescriptor will support stacks of columns (needed in UNION queries with horizontal inheritance), it will also support complex Object[] results, mixing scalars and entities. This is a major refactoring effort that would tie together SELECT clause creating and coding of the DataRow keys (and hopefully will pave a way to future DataRow optimization/removal process).