makssent opened a new pull request, #38812:
URL: https://github.com/apache/shardingsphere/pull/38812

     Changes proposed in this pull request:
       - Add `shardingsphere-database-exception-firebird` module with a 
`FirebirdDialectExceptionMapper` (SPI) so `SQLDialectException` is converted to 
native Firebird errors instead of falling back to generic `isc_random`.
       - Map `UnknownDatabaseException` → `isc_unavailable` (SQLState 08001) 
and `AccessDeniedException` → `isc_login` (SQLState 28000), using native 
GDSCODEs carried as the SQLException vendor code.
       - Add `FirebirdState` for the Firebird-specific SQLState (08001) that is 
not defined in `XOpenSQLState`, mirroring `PostgreSQLState`.
       - Enforce authentication in `FirebirdAuthenticationEngine`: reject 
unknown user on CONNECT and on ATTACH, and reject failed password (the 
`authenticate(...)` result is now checked instead of ignored).
       - Skip the empty `isc_arg_string` in `FirebirdStatusVector` so 
0-argument GDSCODEs (e.g. `isc_login`) render the canonical Firebird catalog 
message; add a null-message guard.
       - Wire the module into `bom`, the dialect-exception aggregator pom, and 
`database-protocol-firebird` so the SPI is on the proxy runtime classpath.
       - Scope note: only the two errors above are verified against a live 
Firebird client; other `SQLDialectException`s intentionally fall back to 
`UnknownSQLException` and will be added incrementally.
   
     ---
   
     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.
     - [ ] 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/)
     
   


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