Re: How to compare two window ?

Posted by Hequn Cheng on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/How-to-compare-two-window-tp22347p22355.html

Hi miaoyuan,

> First question

I didn't quite catch your meaning. There are some documents about using window in sql[1] or table-api[2] and it is worth to take a look.

> Second question

Group by window without other keys results a AllWindowedStream. Sql like bellow:

SELECT COUNT(*)
, TUMBLE_START(rowtime, INTERVAL '15' MINUTE)
, TUMBLE_END(rowtime, INTERVAL '15' MINUTE)
FROM MyTable
GROUP BY TUMBLE(rowtime, INTERVAL '15' MINUTE)

> Third question

You can print or sink data into external storages and compare the result.

Best, Hequn

[1] https://ci.apache.org/projects/flink/flink-docs-master/dev/table/sql.html#group-windows

[2] https://ci.apache.org/projects/flink/flink-docs-master/dev/table/tableApi.html#group-windows

On Thu, Aug 16, 2018 at 2:26 PM, 苗元君 <[hidden email]> wrote:

Hi, Flink guys, 

U really to a quick release, it's fantastic ! 

I'v got a situation , 

window 1 is time driven, slice is 1min, trigger is 1 count

window 2 is count driven, slice is 3 count, trigger is 1count

1. Then element is out of window1 and just right into window2. 

    For example if there is only 2 element, window2 will have none element.  how to build window like this ? 

   I try to use window1 by structure (window trigger evictor) then window2 structure(trigger evictor)

   I got element calculate just in window1 and window2 in the same time

2.  I try to find ways to use SQL on AllWindowedStream but seem not working. Can SQL Query use on a WINDOW ?

3.  How to compare these SQL result ?

Thank U so much.

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