Yea right now the SUM is an "old school" metric. I used to get around this issue by changing `SUM` to `sum` or make some ad hoc modification similar to [this](https://github.com/apache/incubator-superset/issues/5308).
Here's a screenshot with changing the metric name <img width="1429" alt="screen shot 2018-09-07 at 3 05 42 pm" src="https://user-images.githubusercontent.com/7282400/45238515-0ef92f80-b2b0-11e8-86e4-d948288c1d82.png";> [ Full content available at: https://github.com/apache/incubator-superset/pull/5827 ] This message was relayed via gitbox.apache.org for [email protected]
![https://user-images.githubusercontent.com/7282400/45238515-0ef92f80-b2b0-11e8-86e4-d948288c1d82.png"](https://user-images.githubusercontent.com/7282400/45238515-0ef92f80-b2b0-11e8-86e4-d948288c1d82.png"){kind=link}