Delegation Rules: SELECT Clause for Aggregating Queries
The following rules apply when determining what can be delegated to a data provider:
- All data source providers must support returning all columns from a data source.
- All data source providers must support returning a subset of the columns in the data source.
- All data source providers must support aliasing of an attribute in the SELECT clause.
- All data source providers must be able to return an attribute from the data source in any order.
- Aggregating functions and operators must be in the SELECT clause.