imay commented on a change in pull request #2777: [Alter] Add more schema 
change to varchar type
URL: https://github.com/apache/incubator-doris/pull/2777#discussion_r367736246
 
 

 ##########
 File path: be/src/olap/types.h
 ##########
 @@ -477,6 +477,11 @@ struct FieldTypeTraits<OLAP_FIELD_TYPE_FLOAT> : public 
BaseFieldtypeTraits<OLAP_
         *reinterpret_cast<CppType*>(buf) = value;
         return OLAP_SUCCESS;
     }
+    static std::string to_string(const void* src) {
+        char buf[1024] = {'\0'};
+        snprintf(buf, sizeof(buf), "%.10f", *reinterpret_cast<const 
CppType*>(src));
 
 Review comment:
   Better use FloatToBuffer and DoubleToBuffer in 
be/src/gutil/strings/numbers.h to unify our float->string output format

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