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window_time 函数

适用于：勾选“是” Databricks SQL 勾选“是” Databricks Runtime 12.2 LTS 及更高版本

返回由 window 或 session_window 函数生成的时间窗口的包含结束时间。

语法

window_time(window)

争论

  • window：由 window 函数生成的 列。

退货

一个具有窗口的非独占终结点的 TIMESTAMP 值。 这等效于 window.end - INTERVAL '0.000001' SECOND

示例

> SELECT a, window.start as start, window.end as end, window_time(window), cnt
    FROM (SELECT a, window, count(*) as cnt
           FROM VALUES ('A1', '2021-01-01 00:00:00'),
                       ('A1', '2021-01-01 00:04:30'),
                       ('A1', '2021-01-01 00:06:00'),
                       ('A2', '2021-01-01 00:01:00') AS tab(a, b)
           GROUP by a, window(b, '5 MINUTES'))
    ORDER BY a, window.start;
  A1  2021-01-01 00:00:00  2021-01-01 00:05:00  2021-01-01 00:04:59.999999 2
  A1  2021-01-01 00:05:00  2021-01-01 00:10:00  2021-01-01 00:09:59.999999 1
  A2  2021-01-01 00:00:00  2021-01-01 00:05:00  2021-01-01 00:04:59.999999 1