mchades opened a new issue, #12552:
URL: https://github.com/apache/gravitino/issues/12552
### Describe the feature
Add an API to test an existing catalog connection using its stored
configuration.
### Motivation
The current API only validates connection properties before catalog
creation. Users need the same capability after a catalog has been created,
especially when credentials, network configuration, or external services change.
### Describe the solution
- Add `POST /api/metalakes/{metalake}/catalogs/{catalog}/testConnection`.
- Reuse lightweight, read-only probes for supported providers.
- Probe Fileset catalog-level locations through HCFS, including multiple
locations and credential vending.
- Return existing application error codes without introducing a new response
DTO.
- Report Model and Generic catalogs as unsupported.
### Additional context
Fileset connection testing only probes catalog-level `location` and
`location-*` properties. It does not traverse schemas or filesets.
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