Function duckdb_scalar_function_set_init 

pub unsafe extern "C" fn duckdb_scalar_function_set_init(
    scalar_function: duckdb_scalar_function,
    init: duckdb_scalar_function_init_t,
)

Sets the (optional) state init function of the scalar function. This is called once for each worker thread that begins executing the function @param scalar_function The scalar function. @param init The init function.