Previously, users noticed that clicking the Download Data As CSV button in the table component (with Download as Raw CSV turned off) resulted in some blank columns, even though the columns should have had data. Adding {{self}} as the mapper often resolved the issue.
Users have also asked for the download CSV functionality to include custom columns.
Today, this should 
just work in our new Table component! You can download the data as CSV by clicking the download icon in the toolbar.
Drag in a new Table component to try this out and let us know if you have any questions!