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https://issues.apache.org/jira/browse/FLINK-7635?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16170922#comment-16170922
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Chen Qin commented on FLINK-7635:
---------------------------------

[~phoenixjiangnan] there are good reference in PorcessFunction.Context 
especially in unit tests and comments. Also might consider how to surface 
OutputTag error message to user where late arriving events conflict with ones 
from ProcessWindowFunction possible.


> support sideOutput in ProcessWindowFunciton & ProcessAllWindowFunction
> ----------------------------------------------------------------------
>
>                 Key: FLINK-7635
>                 URL: https://issues.apache.org/jira/browse/FLINK-7635
>             Project: Flink
>          Issue Type: Improvement
>          Components: DataStream API, Scala API
>            Reporter: Chen Qin
>            Assignee: Bowen Li
>            Priority: Minor
>             Fix For: 1.4.0, 1.3.3
>
>
> [FLINK-4460|https://issues.apache.org/jira/browse/FLINK-4460] only 
> implemented output to ProcessFunction Context. It would be nice to add 
> support to ProcessWindow and ProcessAllWindow functions as well. [email 
> threads|http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/question-on-sideoutput-from-ProcessWindow-function-td15500.html]
> [~aljoscha] I thought this is good warm up task for ppl to learn how window 
> function works in general. Otherwise feel free to assign back to me.



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