private com.google.protobuf.MapField<java.lang.Long, java.lang.String> internalGetMutableQuestionIdToAnswer() {
            if (questionIdToAnswer_ == null) {
                questionIdToAnswer_ = com.google.protobuf.MapField
                        .newMapField(QuestionIdToAnswerDefaultEntryHolder.defaultEntry);
            }
            if (!questionIdToAnswer_.isMutable()) {
                questionIdToAnswer_ = questionIdToAnswer_.copy();
            }
            bitField0_ |= 0x00000001;
            onChanged();
            return questionIdToAnswer_;
        }
Protobuf type {@code im.turms.proto.CheckGroupJoinQuestionsAnswersRequest}
turms-server-common/src/main/java/im/turms/server/common/access/client/dto/request/group/enrollment/CheckGroupJoinQuestionsAnswersRequest.java