daiqianshi opened a new issue #6455:
URL: https://github.com/apache/skywalking/issues/6455
Please answer these questions before submitting your issue.
- Why do you submit this issue?
- [ ] Question or discussion
- [ ] Bug
- [ ] Requirement
- [ ] Feature or performance improvement
___
___
### Bug
- Which version of SkyWalking, OS, and JRE?
SkyWalking:8.3.0, OS:Centos, java:1.8.0_221
- What happened?
The error only returned by ES database,Mysql is ok. Is there any
additional configuration I need to add?
```json
{
"errors": [{
"message": "Cannot return null for non-nullable type: 'String'
within parent 'SelectedRecord' (/readSampledRecords[0]/name)"
}, {
"message": "Cannot return null for non-nullable type: 'String'
within parent 'SelectedRecord' (/readSampledRecords[1]/name)"
}]
}
```
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