JDBC adapter: Better alias derivation.
Add "close()" methods to various enumerators. Stops a few resource leaks.
Complete list of disabled FoodMart test IDs. All others currently pass.
Change how Optiq calculates whether aggregates and windowed aggregates are null. The call is NOT NULL if its args are NOT NULL; the context (e.g. in a query with GROUP BY (), or in a window that may be empty) may convert it to nullable.
Fix some FoodMart tests.