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From "Stephan Ewen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-1235) Compiler rejectes non-nested iterations in constant path of an Iteration.
Date Wed, 12 Nov 2014 20:46:34 GMT

    [ https://issues.apache.org/jira/browse/FLINK-1235?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14208652#comment-14208652
] 

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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