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File size: 1,365 Bytes
e8c001c | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | -- flinksql_006: 异常事件过滤 + 窗口 TopN
-- datagen 生成设备事件流 @ 80 rows/sec, event_type=3 过滤后 Tumble 1min Top-5
-- 1. 设备事件流 datagen 源表
CREATE TABLE device_source (
device_id INT,
event_type INT,
province VARCHAR,
event_time AS LOCALTIMESTAMP,
WATERMARK FOR event_time AS event_time - INTERVAL '5' SECOND
) WITH (
'connector' = 'datagen',
'rows-per-second' = '80',
'fields.event_type.kind' = 'random',
'fields.event_type.min' = '1',
'fields.event_type.max' = '10',
'fields.province.kind' = 'random',
'fields.province.length' = '4'
);
-- 2. Console 输出表
CREATE TABLE console_output (
window_start TIMESTAMP,
province VARCHAR,
abnormal_cnt BIGINT,
`rank` BIGINT
) WITH (
'connector' = 'print'
);
-- 3. 过滤异常事件(event_type=3) → Tumble 窗口 → Top-5
INSERT INTO console_output
SELECT
window_start,
province,
abnormal_cnt,
`rank`
FROM (
SELECT
TUMBLE_START(event_time, INTERVAL '1' MINUTE) AS window_start,
province,
COUNT(*) AS abnormal_cnt,
ROW_NUMBER() OVER (PARTITION BY TUMBLE_START(event_time, INTERVAL '1' MINUTE) ORDER BY COUNT(*) DESC) AS `rank`
FROM device_source
WHERE event_type = 3
GROUP BY TUMBLE(event_time, INTERVAL '1' MINUTE), province
)
WHERE `rank` <= 5;
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