Arrow Database Connectivity (ADBC) C interface
Apache Software Foundation

ffi.rs contains modified Rust declarations transcribed from the Apache-2.0 ADBC C
header vendored by DuckDB 1.5.6 at src/include/duckdb/common/adbc/adbc.h.
The original license notice is preserved in ffi.rs. The declarations are modified
for Rust types, callback representation and layout checks.

The driver implementation is a Rust port of DuckDB's MIT-licensed ADBC adapter.
No C or C++ engine is linked by these modules.
