So, I managed to find a solution. Looking at the discussion in Issue [#4770](https://github.com/apache/incubator-superset/issues/4770), it didn't feel quite the same issue as the one displayed here.
This is how I managed to solve it: 1. I went to the tab 'Charts' 2. I clicked on 'Edit records' in the corresponding chart 3. In the 'Parameters' section, I looked for the variable with name 'label' and changed it from `SUM(weekly_returning_users)` to `sum(weekly_returning_users)`  Comparing to Issue #4770, I am editing the labels used in the Chart and not the datasource column names. [ Full content available at: https://github.com/apache/incubator-superset/issues/5700 ] This message was relayed via gitbox.apache.org for [email protected]
