[I] [Bug] conv() with float value as input parameter leads to incorrect result [doris]

[via GitHub]

yoursweetie opened a new issue, #39618:
URL: https://github.com/apache/doris/issues/39618

   ### 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
   
   ### What's Wrong?
   
   conv() with float value as input parameter leads to incorrect result
   
   ### What You Expected?
   
   float value or other illegal values are banned from conv() function
   
   ### How to Reproduce?
   
   Just execute
   ```
   create table test_tb(int_1 int, float_2 float);
   
   insert into test_tb values(1, 1.464868);
   
   select conv(float_2,10,2),float_2 from test_tb;
   ```
   
![图片](https://github.com/user-attachments/assets/ed8c5144-cc89-4b9d-be82-da459c18b3f9)
   
   The result "0" is incorrect, it should be like "0 01111111 
01110111000000011001011"
   
   
![图片](https://github.com/user-attachments/assets/3b8ac6ff-19a2-44c7-aab7-d9d95b50066e)
   
   BTW, I suggest that the conv() prohibits floating-point numbers as input 
parameters
   
   ### Anything Else?
   
   _No response_
   
   ### Are you willing to submit PR?
   
   - [X] 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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