mybatis-plus查找单个字段的办法

LambdaQueryWrapper replyLambdaQueryWrapper = new LambdaQueryWrapper<>();
replyLambdaQueryWrapper.select(SrmSrpProdGroupReply::getId).eq(SrmSrpProdGroupReply::getProdGroupId, srmSrpProdGroup.getId());

List srmSrpProdGroupReplies = srmSrpProdGroupReplyMapper.selectList(replyLambdaQueryWrapper);

查出来的都是id的list数据