Limit columns that allow drill down
We are repeated running into an issue with some drill downs not going to viable filters and causing the drill path to be blank. For example, on one card we have a table with two columns: dates and the 'number of records' from that date. If you drill down into one of the dates, it gives you a list of all of the records form that date. (Perfect. That is the functionality we need.) However, if you drill into the column with the calculated field 'number of records' the drill path it breaks and the drill down is blank.
This is very frustrating for our less data savvy consumers who do not understand why they can't drill into that column and get the same result. The issue could be resolved by adding an option to the analyzer where, when building a table card, you can tell it which columns can't be drilled into. This would cause the card to grey out (or simply make unclickable) the columns that have been selected. This would prevent the client from unnecessary frustration due to drill paths breaking and seems like it would be relatively easy to implement.
I hope you consider this for development soon!