In addition to the current "Equal" operation, spreadsheet row filters could have a "Range" operation, that filters out values above and below a min and max of the column's type.
This mode could be the default, and when filling in the name of a row filter for the first time, the min and max values could be set to the largest and smallest values of the current data set.
This would mean that no rows would be filtered by default when adding the filter.
- Potential difficulty: How to tell "the first time" apart? Or does that happen whenever changing the name / operation?