makssent opened a new pull request, #40096:
URL: https://github.com/apache/shardingsphere/pull/40096

   Changes proposed in this pull request:
     - `FirebirdBatchReleaseCommandExecutor` throws 
`InvalidBatchHandleException` when there is no open batch, so the client 
receives an `op_response` with `isc_bad_batch_handle` for `op_batch_rls`, and 
the connection stays alive.
     - `FirebirdBatchCancelCommandExecutor` likewise responds to 
`op_batch_cancel` without a batch with an `isc_bad_batch_handle` error, and 
discards the batch if one is open.
   
   Verification:
   The same protocol packets were executed directly against a real database and 
through the proxy, and the results were compared.
   
   * Server: Firebird 5.0
   * Clients: Jaybird 6.0.6
   
   
   ---
   
   Before committing this PR, I'm sure that I have checked the following 
options:
   - [x] My code follows the [code of 
conduct](https://shardingsphere.apache.org/community/en/involved/conduct/code/) 
of this project.
   - [x] I have self-reviewed the commit code.
   - [ ] I have (or in comment I request) added corresponding labels for the 
pull request.
   - [ ] I have passed maven check locally : `./mvnw clean install -B -T1C 
-Dmaven.javadoc.skip -Dmaven.jacoco.skip -e`.
   - [ ] I have made corresponding changes to the documentation.
   - [x] I have added corresponding unit tests for my changes.
   - [ ] I have updated the Release Notes of the current development version. 
For more details, see [Update Release 
Note](https://shardingsphere.apache.org/community/en/involved/contribute/contributor/)
   - [ ] I have specified the tool and the affected files or area for 
substantial AI assistance, as required by the [AI-assisted contribution policy].
   
   [AI-assisted contribution policy]: 
https://github.com/apache/shardingsphere/blob/master/AI_POLICY.md


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