[PR] [Performance](opt) opt the scan performance and remove unless code [doris]

[via GitHub]

HappenLee opened a new pull request, #35604:
URL: https://github.com/apache/doris/pull/35604

   ## Proposed changes
   
   Before
   ```
   select sum(l_linenumber) from lineitem_bak;
   +-------------------+
   | sum(l_linenumber) |
   +-------------------+
   |        1800152937 |
   +-------------------+
   1 row in set (0.17 sec)
   ```
   
   after:
   ```
   select sum(l_linenumber) from lineitem_bak;
   +-------------------+
   | sum(l_linenumber) |
   +-------------------+
   |        1800152937 |
   +-------------------+
   1 row in set (0.14 sec)
   ```
   
   <!--Describe your changes.-->
   
   


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