Minor Description
Currently the Query UI within the WMC needs to know the type of the columns within query result sets in order to present attributes of types such as list, set etc correctly within the grid results. It does this currently by matching column names within the results to the configured object's attribute level metadata. This is fragile approach and will fail if say, a user chose to rename a column within a results set or the query references a parent attributes.
Just like JDBC result sets have metadata, it would be desirable if query results carried metadata too. Derived column values i.e. those resulting from expressions or functions may be problematic but Object would probably suffice for now.