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https://issues.apache.org/jira/browse/FLINK-1091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14125424#comment-14125424
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Stephan Ewen commented on FLINK-1091:
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I think we should make this a part of the DeltaIteration generalization effort
as in https://issues.apache.org/jira/browse/FLINK-1092
> Allow joins with the solution set using key selectors
> -----------------------------------------------------
>
> Key: FLINK-1091
> URL: https://issues.apache.org/jira/browse/FLINK-1091
> Project: Flink
> Issue Type: Improvement
> Components: Iterations
> Reporter: Vasia Kalavri
> Priority: Minor
> Labels: easyfix, features
>
> Currently, the solution set may only be joined with using tuple field
> positions.
> A possible solution can be providing explicit functions "joinWithSolution"
> and "coGroupWithSolution" to make sure the keys used are valid.
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