输入：

|   a.user_id    | a_stream_length  | b_stream_length  | subtract_inactive  |
-----------------------------------------------------------------------------
|      a         | 11               | 1686             | 22                 |
|      a         | 1686             | 328              | 12                 |
|      a         | 328              | 732              | 22                 |
|      a         | 732              | 11               | 1699               |
|      a         | 11               | 2123             | 18                 |
|      a         | 2123             | 160              | 2                  |
|      a         | 160              | 1358             | 0                  |
|      a         | 1358             | 129              | 1                  |
|      a         | 129              | 4042             | 109334             |

输出：

|      a         | (1686+11+328+732)   (if subtract_inactive < 1000) |
|      a         | 732(a_stream_length) if subtract_inactive > 1000) |