[I] [Bug] 文本类型小数无法使用bigint转数值，decimal(38,0) + decimal(38,8)的情况下会返回整数 [doris]

[via GitHub]

Jinxv1007 opened a new issue, #40956:
URL: https://github.com/apache/doris/issues/40956

   ### Search before asking
   
   - [X] I had searched in the 
[issues](https://github.com/apache/doris/issues?q=is%3Aissue) and found no 
similar issues.
   
   
   ### Version
   
   2.1.5
   
   ### What's Wrong?
   
   文本类型小数无法使用bigint转数值
   
![image](https://github.com/user-attachments/assets/8e8e4225-a9e7-435f-ac0c-6038484a7f38)
   decimal(38,0) + decimal(38,8)的情况下会返回整数
   
![image](https://github.com/user-attachments/assets/b72dd614-d0e2-4ce1-94bb-3a293f51296c)
   
   
   ### What You Expected?
   
    CAST("123.123" AS BIGINT) 能返回123而不是null;
     CAST(123 AS DECIMAL(38,0))+CAST(123.123 AS DECIMAL(38,8) 返回小数而不是整数
   
   ### How to Reproduce?
   
   _No response_
   
   ### Anything Else?
   
   _No response_
   
   ### Are you willing to submit PR?
   
   - [ ] Yes I am willing to submit a PR!
   
   ### Code of Conduct
   
   - [X] I agree to follow this project's [Code of 
Conduct](https://www.apache.org/foundation/policies/conduct)
   


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