ferenc-csaky opened a new pull request, #23501:
URL: https://github.com/apache/flink/pull/23501
## What is the purpose of the change
Forbid to drop the currently used database.
## Brief change log
`CatalogManager.dropDatabase(...)` now throws a `CatalogException` if it is
called with `currentCatalogName` and `currentDatabaseName`.
Using `CatalogException` is debateble, there is no applicable DB related
exception yet, but we may introduce a specific one for this if it seems more
appropriate.
## Verifying this change
Added new unit test to cover dropping current database.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): no
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: no
- The serializers: no
- The runtime per-record code paths (performance sensitive): no
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? no
- If yes, how is the feature documented? not applicable
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