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https://issues.apache.org/jira/browse/FLINK-1091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14123473#comment-14123473
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Vasia Kalavri commented on FLINK-1091:
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As I said in dev@, I would like to first understand whether restricting the
operations to join and cogroup is a requirement for some reason (like
disallowing writing invalid constructs) or whether you did not see the use case
for it.
> 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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