xiongxoy opened a new pull request, #13617:
URL: https://github.com/apache/skywalking/pull/13617
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### Fix <bug description or the bug issue number or bug issue link>
- [x] Add a unit test to verify that the fix works.
- [x] Explain briefly why the bug exists and how to fix it.
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### Improve the performance of <class or module or ...>
- [ ] Add a benchmark for the improvement, refer to [the existing
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- [ ] The benchmark result.
```text
<Paste the benchmark results here>
```
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- [ ] If this pull request closes/resolves/fixes an existing issue, replace
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- [x] Update the [`CHANGES`
log](https://github.com/apache/skywalking/blob/master/docs/en/changes/changes.md).
When using tag auto-complete, if searchable tags have null values, the
following error happens. The fix checks empty value in tag, so no searchable
tag with empty value is pushed to storage.
```
{
"errors": [
{
"message": "The field at path '/tagValues[0]' was declared as a
non null type, but the code involved in retrieving data has wrongly returned a
null value. The graphql specification requires that the parent field be set to
null, or if that is non nullable that it bubble up null to its parent and so
on. The non-nullable type is 'String' within parent type '[String!]'",
"path": [
"tagValues",
0
],
"extensions": {
"classification": "NullValueInNonNullableField"
}
}
],
"data": {
"tagValues": null
}
}
```
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