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https://issues.apache.org/jira/browse/FLINK-3959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15296475#comment-15296475
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Aljoscha Krettek commented on FLINK-3959:
-----------------------------------------
We should think about this. Most other streaming APIs frameworks have the
"implicit sink" functionality so Flink would have the unexpected behavior for
most people.
> Remove implicit sinks
> ---------------------
>
> Key: FLINK-3959
> URL: https://issues.apache.org/jira/browse/FLINK-3959
> Project: Flink
> Issue Type: Sub-task
> Components: Streaming
> Reporter: Stephan Ewen
> Fix For: 2.0.0
>
>
> Right now, streaming programs need not specify a sink. All transformations
> that are not consumed are implicitly sinks.
> That behavior makes it hard to lazily construct the stream graph on
> execution, and prevents interactive sessions on streams.
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