[Feature Request]: [Go SDK] Support OnWindowExpiration
Open
go
new feature
P2
- Dominant language
- Java
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Description
### What would you like to happen?
Note: Blocked on State API See #20510. Context: https://lists.apache.org/thread.html/1dab7f17c97378e665928b11116cbd887dc7be93390ab26c593ee49a@%3Cdev.beam.apache.org%3E
Essentially, a callback method to handle any state before the Runner cleans it up. See thread for details.
### Issue Priority
Priority: 2
### Issue Component
Component: sdk-go
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