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https://issues.apache.org/jira/browse/FLINK-3174?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15224521#comment-15224521
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ASF GitHub Bot commented on FLINK-3174:
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Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/1802#issuecomment-205394604
No, we introduced the `InternalWindowFunction` before 1.0.0 to decouple the
user `WindowFunction` from the window operator implementation. There are now
special `InternalWindowFunctions` that don't forward the key to the user
function. The API for the user does not change, there an `AllWindowFunction` is
used, as before. And that function does not get a key.
> Add merging WindowAssigner
> --------------------------
>
> Key: FLINK-3174
> URL: https://issues.apache.org/jira/browse/FLINK-3174
> Project: Flink
> Issue Type: Improvement
> Components: Streaming
> Reporter: Aljoscha Krettek
> Assignee: Aljoscha Krettek
> Fix For: 1.0.0
>
>
> We should add the possibility for WindowAssigners to merge windows. This will
> enable Session windowing support, similar to how Google Cloud Dataflow
> supports.
> For session windows, each element would initially be assigned to its own
> window. When triggering we check the windows and see if any can be merged.
> This way, elements with overlapping session windows merge into one session.
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