jixuan1989 opened a new pull request, #109:
URL: https://github.com/apache/iotdb-extras/pull/109
## Summary
When a multi-value Grafana template variable is used in `prefixPath` (e.g.
`root.application.${device}`), the plugin now expands it into multiple valid
IoTDB paths instead of producing an invalid concatenated path like
`root.application.device1,device2`.
This enables the common "global variable filter" dashboard pattern where a
single multi-select dropdown controls all panels simultaneously.
## Changes
- **`connectors/grafana-plugin/src/datasource.ts`**: Modified
`applyTemplateVariables` to detect multi-value variables in `prefixPath` and
expand them into separate paths using the `pipe` format.
- **`connectors/grafana-plugin/src/datasource.test.ts`**: Added unit tests
covering literal paths, single-value variables, multi-value expansion, mixed
paths, and backward compatibility.
- **`connectors/grafana-plugin/README.md`**: Documented the multi-value
variable expansion feature in the template variables section.
## Backward Compatibility
Fully backward-compatible:
- Paths without variables pass through unchanged
- Single-value variables produce the same result as before
- Only multi-value variables with multiple selected values trigger the new
expansion logic
## Testing
```
npx jest --testPathPattern='datasource.test' --no-coverage
PASS src/datasource.test.ts (8 tests passed)
```
Closes #108
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