Improve DuckDB connector

[Gaploid]

DuckDB Connector Improvements

Changes

• Optimized query execution for queries without parameters
• Improved parameter handling in DuckDB connector
• Enhanced transaction management for parameterized queries
• Added better error handling and type conversion

Technical Details

• Implemented direct query execution for queries without parameters
• Added transaction-based approach for parameterized queries
• Improved type handling and conversion for different parameter types
• Enhanced error messages and error handling

Testing

• Tested with both parameterized and non-parameterized queries
• Verified transaction handling and read-only mode
• Confirmed proper type conversion for various data types

Impact

These changes improve the performance and reliability of the DuckDB connector, especially for queries without parameters.