使用窗口翻转时如何从 KSQL 流中获取最后一个值

Question

How can I select the last record from a stream when using Window Tumbling?

I can not find any KSQL function for that.

I would like to achieve something like:

SELECT
  max(charge) AS maxCharge,
  last(charge) AS lastCharge
FROM charge_stream
WINDOW TUMBLING (SIZE 1 MINUTES)
GROUP BY deviceID

Except that last is not a valid KSQL function.

Answer 1

我想你要找的是LATEST_BY_OFFSET 。