[PR] [Performance](opt) opt the memcpy and string compare performance [doris]

[via GitHub]

HappenLee opened a new pull request, #35713:
URL: https://github.com/apache/doris/pull/35713

   ## Proposed changes
   
   Before：
   ```
   select count(cust_id) from     ( select * from rpt where dt = '2023-06-19' 
and dkye>0) a         join     ( select * from rpt1 where dt = '2023-06-19') b  
   on b.cust_id = a.hxkhh;
   +----------------+
   | count(cust_id) |
   +----------------+
   |      515127559 |
   +----------------+
   1 row in set (5.85 sec)
   
   ```
   
   after:
   ```
   ```
   select count(cust_id) from     ( select * from rpt where dt = '2023-06-19' 
and dkye>0) a         join     ( select * from rpt1 where dt = '2023-06-19') b  
   on b.cust_id = a.hxkhh;
   +----------------+
   | count(cust_id) |
   +----------------+
   |      515127559 |
   +----------------+
   1 row in set (4.25 sec)
   
   ```
   
   <!--Describe your changes.-->
   
   


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