maxNonNullValue

  interface maxNonNullValue
    subroutine maxNonNullValueSingle(tab, colName, maxValue, allRowsNull)
      type(TableT),  intent(in)  :: tab
      character(*),  intent(in)  :: colName
      real(single),  intent(out) :: maxValue
      logical(bool), intent(out) :: allRowsNull
    end subroutine maxNonNullValueSingle

    subroutine maxNonNullValueDouble(tab, colName, maxValue, allRowsNull)
      type(TableT),  intent(in)  :: tab
      character(*),  intent(in)  :: colName
      real(double),  intent(out) :: maxValue
      logical(bool), intent(out) :: allRowsNull
    end subroutine maxNonNullValueDouble
  end interface