Virtual columns can really drag down performance when working with complex expressions across large datasets. But I noticed that many times there is no need to compute the column for all the rows, it is just needed for a small fraction of them.
In these cases it would be very handy to have a Compute if option.
This would be for cases in which security filters won't do the job because the creator still needs the rest of the rows for some other calculation in the same app.
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