Function laminar_schema_export 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn laminar_schema_export(
    schema: *mut LaminarSchema,
    out_schema: *mut FFI_ArrowSchema,
) -> i32

Export just the schema to the Arrow C Data Interface.

Safety

schema and out_schema must be valid non-null pointers; caller must call the release callback.