CREATE TABLE numbers_input (
    number INT,
    ts TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    PRIMARY KEY(number),
    TIME INDEX(ts)
);

Affected Rows: 0

CREATE FLOW test_numbers 
SINK TO out_num_cnt
AS 
SELECT sum(number) FROM numbers_input GROUP BY tumble(ts, '1 second', '2021-07-01 00:00:00');

Affected Rows: 0

INSERT INTO numbers_input 
VALUES
    (20, "2021-07-01 00:00:00.200"),
    (22, "2021-07-01 00:00:00.600");

Affected Rows: 2

-- SQLNESS SLEEP 3s
SELECT col_0, window_start, window_end FROM out_num_cnt;

+-------+---------------------+---------------------+
| col_0 | window_start        | window_end          |
+-------+---------------------+---------------------+
| 42    | 2021-07-01T00:00:00 | 2021-07-01T00:00:01 |
+-------+---------------------+---------------------+

INSERT INTO numbers_input 
VALUES
    (23,"2021-07-01 00:00:01.000"),
    (24,"2021-07-01 00:00:01.500");

Affected Rows: 2

-- SQLNESS SLEEP 2s
SELECT col_0, window_start, window_end FROM out_num_cnt;

+-------+---------------------+---------------------+
| col_0 | window_start        | window_end          |
+-------+---------------------+---------------------+
| 42    | 2021-07-01T00:00:00 | 2021-07-01T00:00:01 |
| 47    | 2021-07-01T00:00:01 | 2021-07-01T00:00:02 |
+-------+---------------------+---------------------+

DROP FLOW test_numbers;

Affected Rows: 0

DROP TABLE numbers_input;

Affected Rows: 0

DROP TABLE out_num_cnt;

Affected Rows: 0