# File lib/logging/stats.rb, line 47
    def coalesce( other )
      @sum += other.sum
      @sumsq += other.sumsq
      if other.num > 0
        @min = other.min if @min > other.min
        @max = other.max if @max < other.max
        @last = other.last
      end
      @num += other.num
    end