[PR] [opt](cast) use fmt in cast float to string [doris]

[via GitHub]

Mryange opened a new pull request, #37592:
URL: https://github.com/apache/doris/pull/37592

   ## Proposed changes
   
   before
   ```
   mysql [test10]>select cast(f64 as string) from nums;
   +--------------+
   | ReturnedRows |
   +--------------+
   | 20000000     |
   +--------------+
   1 row in set (0.48 sec)
   
   mysql [test10]>select cast(f32 as string) from nums;
   +--------------+
   | ReturnedRows |
   +--------------+
   | 20000000     |
   +--------------+
   1 row in set (0.98 sec)
   
   ```
   
   now
   ```
   mysql [test10]>select cast(f64 as string) from nums;
   +--------------+
   | ReturnedRows |
   +--------------+
   | 20000000     |
   +--------------+
   1 row in set (0.42 sec)
   
   mysql [test10]>select cast(f32 as string) from nums;
   +--------------+
   | ReturnedRows |
   +--------------+
   | 20000000     |
   +--------------+
   1 row in set (0.43 sec)
   ```
   
   <!--Describe your changes.-->
   
   


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