[GitHub] [doris] HappenLee opened a new pull request, #25029: [opt](function) Use Dict to opt the function of time_round

[via GitHub]

HappenLee opened a new pull request, #25029:
URL: https://github.com/apache/doris/pull/25029

   ## Proposed changes
   
   Before：
   ```
   select hour_floor(`@timestamp`, 7) as t, count() as cnt from httplogs_date 
group by t order by t limit 10;
   +---------------------+--------+
   | t                   | cnt    |
   +---------------------+--------+
   | 1998-04-30 21:00:00 |    324 |
   | 1998-05-01 04:00:00 | 286156 |
   | 1998-05-01 11:00:00 | 266130 |
   | 1998-05-01 18:00:00 | 483765 |
   | 1998-05-02 01:00:00 | 276706 |
   | 1998-05-02 08:00:00 | 169945 |
   | 1998-05-02 15:00:00 | 223593 |
   | 1998-05-02 22:00:00 | 272616 |
   | 1998-05-03 05:00:00 | 188689 |
   | 1998-05-03 12:00:00 | 184405 |
   +---------------------+--------+
   10 rows in set (3.39 sec)
   ```
   
   after:
   ```
   select hour_floor(`@timestamp`, 7) as t, count() as cnt from httplogs_date 
group by t order by t limit 10;
   +---------------------+--------+
   | t                   | cnt    |
   +---------------------+--------+
   | 1998-04-30 21:00:00 |    324 |
   | 1998-05-01 04:00:00 | 286156 |
   | 1998-05-01 11:00:00 | 266130 |
   | 1998-05-01 18:00:00 | 483765 |
   | 1998-05-02 01:00:00 | 276706 |
   | 1998-05-02 08:00:00 | 169945 |
   | 1998-05-02 15:00:00 | 223593 |
   | 1998-05-02 22:00:00 | 272616 |
   | 1998-05-03 05:00:00 | 188689 |
   | 1998-05-03 12:00:00 | 184405 |
   +---------------------+--------+
   10 rows in set (2.19 sec)
   ```
   
   <!--Describe your changes.-->
   
   ## Further comments
   
   If this is a relatively large or complex change, kick off the discussion at 
[d...@doris.apache.org](mailto:d...@doris.apache.org) by explaining why you 
chose the solution you did and what alternatives you considered, etc...
   
   


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