Function add

python/pathway/tests/test_udf.py:297–301

(a: int, b: int)

    @pw.udf(executor=get_async_executor(fully_async), propagate_none=True)
    def add(a: int, b: int) -> int:
        assert a is not None
        assert b is not None
        internal_add()
        return a + b

    input = T(
        """