適用於：
Databricks SQL Databricks Runtime 10.4 LTS 和更新版本
在時間戳記表示式上創建會話窗口。
語法
session_window(expr, gapDuration)
引數
-
expr：指定視窗主旨的TIMESTAMP表示式。 -
gapDuration：STRING表達式表示窗口寬度為INTERVAL DAY TO SECOND常量。
返回
傳回一組可使用聚合函數運作的群組。
GROUP BY 的資料列名稱是 session_window。 其類型為 STRUCT<start:TIMESTAMP, end:TIMESTAMP>
範例
> SELECT a, session_window.start, session_window.end, count(*) as cnt
FROM VALUES ('A1', '2021-01-01 00:00:00'),
('A1', '2021-01-01 00:04:30'),
('A1', '2021-01-01 00:10:00'),
('A2', '2021-01-01 00:01:00') AS tab(a, b)
GROUP by a, session_window(b, '5 minutes')
ORDER BY a, start;
A1 2021-01-01 00:00:00 2021-01-01 00:09:30 2
A1 2021-01-01 00:10:00 2021-01-01 00:15:00 1
A2 2021-01-01 00:01:00 2021-01-01 00:06:00 1
> SELECT a, session_window.start, session_window.end, count(*) as cnt
FROM VALUES ('A1', '2021-01-01 00:00:00'),
('A1', '2021-01-01 00:04:30'),
('A1', '2021-01-01 00:10:00'),
('A2', '2021-01-01 00:01:00'),
('A2', '2021-01-01 00:04:30') AS tab(a, b)
GROUP by a, session_window(b, CASE WHEN a = 'A1' THEN '5 minutes'
WHEN a = 'A2' THEN '1 minute'
ELSE '10 minutes' END)
ORDER BY a, start;
A1 2021-01-01 00:00:00 2021-01-01 00:09:30 2
A1 2021-01-01 00:10:00 2021-01-01 00:15:00 1
A2 2021-01-01 00:01:00 2021-01-01 00:02:00 1
A2 2021-01-01 00:04:30 2021-01-01 00:05:30 1