Grouping needed in preview version
In the GA version grouping is supported using the "split by" feature, or actually by not using it. Doing aggregates using grouping is my major use case and I guess that others need it too.
The preview version has a more appealing price model, and I would prefer to work the preview version than sticking to a "doomed" version since we are in early stages of the project.
Suggestion: Add a way to do grouping in preview version