I created question that is native SQL, inside this question I defined variable, so that I can then use a (text) filter in dashboard. This works fine.
Then I created a new question/chart from this saved question and wanted to set the same (text) filter in the dashboard for this chart. But the dashboard does not offer me to select this variable/column for filtering. Why ?
Is it because I created a variable in the original SQL question ? What is the correct approach?