imay commented on a change in pull request #2310: Marising
URL: https://github.com/apache/incubator-doris/pull/2310#discussion_r351162301
 
 

 ##########
 File path: be/src/olap/types.h
 ##########
 @@ -374,6 +384,20 @@ struct FieldTypeTraits<OLAP_FIELD_TYPE_DOUBLE> : public 
BaseFieldtypeTraits<OLAP
         snprintf(buf, sizeof(buf), "%.10f", *reinterpret_cast<const 
CppType*>(src));
         return std::string(buf);
     }
+    static OLAPStatus convert_from(void* dest, const void* src, const 
TypeInfo* src_type, MemPool* mem_pool) {
+        //only support float now
+        if(src_type->type() == OLAP_FIELD_TYPE_FLOAT){
+            using SrcType = typename 
CppTypeTraits<OLAP_FIELD_TYPE_FLOAT>::CppType;
+            char buf[64];
+            memset(buf,0,sizeof(buf));            
+            sprintf(buf,"%f",*reinterpret_cast<const SrcType*>(src));
 
 Review comment:
   1. prefer snprintf
   2. we prefer add a space after `,`
   ```suggestion
               snprintf(buf, 64, "%f", *reinterpret_cast<const SrcType*>(src));
   ```

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