Function duckdb_replacement_scan_set_function_name 

pub unsafe extern "C" fn duckdb_replacement_scan_set_function_name(
    info: duckdb_replacement_scan_info,
    function_name: *const c_char,
)

Sets the replacement function name. If this function is called in the replacement callback, the replacement scan is performed. If it is not called, the replacement callback is not performed.

@param info The info object @param function_name The function name to substitute.