davidhcoe opened a new pull request, #4075:
URL: https://github.com/apache/arrow-adbc/pull/4075

   Implements C# driver manager matching 
[adbc_driver_manager.h](https://github.com/apache/arrow-adbc/blob/main/c/include/arrow-adbc/adbc_driver_manager.h)
 spec:
   
   Core APIs:
   •    LoadDriver() / FindLoadDriver() - Load native/managed drivers
   •    OpenDatabaseFromProfile() - TOML profile support
   •    AdbcLoadFlags - Search control (env/user/system paths)
   
   Features:
   •    Native + managed (.NET) driver loading
   •    TOML manifests with env_var() expansion
      • Uses a custom TOML parser vs Tomlyn because a strong name is required 
for dependencies
   •    Cross-platform driver discovery
   •    Option merging (profile + explicit)
   •    Co-located manifest detection
   
   Tests: 40+ unit tests + sample BigQuery/Snowflake implementations (attached, 
not checked in)
   
   
[BigQueryDriverManagerTests.txt](https://github.com/user-attachments/files/25918821/BigQueryDriverManagerTests.txt)
   
[SnowflakeDriverManagerTests.txt](https://github.com/user-attachments/files/25918824/SnowflakeDriverManagerTests.txt)
   


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