"values" doesn't work for view columns.

[ldhasson]

In general, Tilda will expect "values", if any, to come from a column definition on a table, not a view. The idea is that column definitions happen in tables and are reused in views, so they have to be consistent.

But what if a view column is calculated? We allow values for formulas, and we should allow values as well for view columns with an "expression", which indicates some view-level transformation.