wutiangan opened a new issue #2924: Error of exporting double type data
URL: https://github.com/apache/incubator-doris/issues/2924
 
 
   When exporting a table of type double to HDFS, the data of conversion is 
wrong.
   
   When doris be exports data of type double, the values of all columns are 
converted to the form of stringstream, but the precision will be lost if the 
type double is directly put into stringstream.
   
   for example:
   
   ```
   double f = 27361919854.929001;
   std: :stringstream ss;
   ss << f;
   cout << ss.str() << endl;
   
   ss.str("");
   ss << std::to_string(f);
   cout << ss.str() << endl;
   ```
   
   
   results:
   ```
   2.73619e+10
   27361919854.929001
   ```

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