Archerll commented on issue #9442:
URL: https://github.com/apache/iotdb/issues/9442#issuecomment-1482394588

   grafana的日志是这样显示的
   `INFO [03-22|21:16:40] QueryData called                         
logger=plugin.apache-iotdb-datasource 
request="map[Headers:map[http_X-Datasource-Uid:KSab4GfVk 
http_X-Grafana-Org-Id:1 http_X-Panel-Id:123125] 
PluginContext:map[AppInstanceSettings:<nil> 
DataSourceInstanceSettings:map[BasicAuthEnabled:false BasicAuthUser: Database: 
DecryptedSecureJSONData:map[password:root] ID:2 
JSONData:map[url:http://127.0.0.1:18080 username:root] Name:Apache IoTDB 
Type:apache-iotdb-datasource UID:KSab4GfVk URL: 
Updated:2023-03-22T11:14:29+08:00 User:] OrgID:1 
PluginID:apache-iotdb-datasource User:map[Email:admin@localhost Login:admin 
Name: Role:Admin]] Queries:[map[Interval:2e+10 
JSON:map[datasource:map[type:apache-iotdb-datasource uid:KSab4GfVk] 
datasourceId:2 expression:[RPN518KM] intervalMs:20000 maxDataPoints:1080 
prefixPath:[root.dc1.m1] refId:A sqlType:SQL: Full Customized] 
MaxDataPoints:1080 QueryType: RefID:A 
TimeRange:map[From:2023-03-22T15:16:40.802+08:00 
To:2023-03-22T21:16:40.803+08:00]
 ]]]"
   ERROR[03-22|21:16:40] prefixPath should not be null            
logger=plugin.apache-iotdb-datasource`


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