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https://issues.apache.org/jira/browse/FLINK-1235?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14208652#comment-14208652
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Stephan Ewen commented on FLINK-1235:
-------------------------------------
Update: The runtime does not support iteration nesting right now.
Inside iterations, you can join / cogroup / cross with data that is "loop
invariant". We call that the "static path" of that operator. When that an
iteration occurs in the static path of another iteration, those two are not
really nested: the on in the static path has to finish before the other one can
execute.
The recursive nature of the translation incorrectly identifies them as nested,
though.
> Compiler rejectes non-nested iterations in constant path of an Iteration.
> -------------------------------------------------------------------------
>
> Key: FLINK-1235
> URL: https://issues.apache.org/jira/browse/FLINK-1235
> Project: Flink
> Issue Type: Bug
> Components: Optimizer
> Affects Versions: 0.8-incubating
> Reporter: Stephan Ewen
> Assignee: Stephan Ewen
> Fix For: 0.8-incubating
>
>
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