[I] set_always_print_primitive_fields will serialize all oneof data. (brpc)

["linjunmian (via GitHub)" <gi...@apache.org>]

linjunmian opened a new issue, #2135:
URL: https://github.com/apache/brpc/issues/2135

   **Describe the bug (描述bug)**
   there is proto3 message
   message Oneof {
       oneof data {
       string str1 = 1;
       string str2 = 2;
   }
   };
   message AA {
   uint32 b=1;
   Oneof c = 2;
   }；
   and aa is an response to a restful service.
   And my b's right value is 0,so i use cntl->set_always_print_primitive_fields(true);  to serialize   b.
   but i find all of c are serialized though i only set the str1 value.
   So the json reponse is :
   {
       "b": 0,
       "service_result": {
          "str1":"xxx",
          "str2":""
       }
   }
   
   **To Reproduce (复现方法)**
   
   
   **Expected behavior (期望行为)**
   I think set_always_print_primitive_fields should not serialize    oneof data
   
   **Versions (各种版本)**
   OS:centos7
   Compiler:gcc11
   brpc:1.3.0
   protobuf:3
   
   **Additional context/screenshots (更多上下文/截图)**
   
   


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