Flink Custom Window __spark

First look at the official Flink custom window process:

The basic operations are as follows: Windows: Creating Custom Windows Trigger: Customizing triggers Evictor: Customizing Evictor Apply: Custom window functions can be seen from the basic actions that define the windows, calling the window function first, Defines a Windowassigner object that is passed in the Windowassigner

Assignwindows sets the window type and then sets the trigger, filter, etc. based on the trigger,evictor.

Finally apply to set user-defined window functions, while Flink itself also integrates a number of window functions, such as Sum,max,maxby,reduce