[teiid-issues] [JBoss JIRA] (TEIID-321) Refactor symbol language objects

Refactor symbol language objects -------------------------------- Key: TEIID-321 URL: https://issues.jboss.org/browse/TEIID-321 Project: Teiid Issue Type: Task Components: Query Engine Affects Versions: 6.0.0 Reporter: Steven Hawkins Assignee: Steven Hawkins Fix For: 9.x Original Estimate: 1 week Remaining Estimate: 1 week Defect Tracker #25035: The current structuring of Symbol objects is confusing and makes planning more difficult than necessary. Changes that should be made: AggregateSymbol should become AggregateFunction (which should not inherit from Function) and not be a Symbol. SingleElementSymbol, ExpressionSymbol, and AliasSymbol should be merged to a single class DerivedSymbol DerivedSymbol and MultipleElementSymbol should implement SelectSymbol (as an interface rather than base class) and SelectSymbol should provide a method for getting the projected symbols. ElementSymbol should not directly be a DerivedSymbol.