我正在配置单元中执行以下命令：

Select child.data_volume_gprs_dl + child.data_volume_gprs_ul as data_usage,
       parent.file_name,
       parent.record_number
  from table1 as parent
  left join table2 child
    on parent.file_name = child.file_name
   and parent.record_number = child.record_number
 where parent.served_imsi like '310120%'
    or parent.served_imsi like '312530%'
   and parent.serving_node_plmn_id like '310260%'
   and parent.date_part = 20191201
 group by parent.file_name, parent.record_number

错误：编译语句时出错：失败：semanticexception[error 10025]：行1:7表达式不在group by键“data\u volume\u gprs\u dl”（state=42000，code=10025）
为什么我会犯这个错误？