如何在Flink SQL中处理时间属性？

-- 1. 定义表（带事件时间和水印）
CREATE TABLE user_events (
    user_id STRING,
    event_time TIMESTAMP(3),
    WATERMARK FOR event_time AS event_time - INTERVAL '5' SECOND
) WITH (...);
-- 2. 执行窗口聚合
SELECT 
    TUMBLE_START(event_time, INTERVAL '10' MINUTE) AS window_start,
    COUNT(*) AS events_count
FROM user_events
GROUP BY TUMBLE(event_time, INTERVAL '10' MINUTE);