public Builder clearQuestions() {
            if (questionsBuilder_ == null) {
                questions_ = java.util.Collections.emptyList();
                bitField0_ &= ~0x00000002;
                onChanged();
            } else {
                questionsBuilder_.clear();
            }
            return this;
        }
<code>repeated .im.turms.proto.GroupJoinQuestion questions = 2;</code>
turms-server-common/src/main/java/im/turms/server/common/access/client/dto/request/group/enrollment/CreateGroupJoinQuestionsRequest.java