Filtered minimum date measure

[kuopaz]

  measure: min_this_date {
    type: date
    sql: min(${this_date}) ;;
    filters: [other_field: "-NULL"]
  }

This will error as filters are not allowed on measures of type date. Filters are allowed on measures of type min, but this does not work for dimensions of type date that has to have the min in the sql. How do I work around this?