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https://issues.apache.org/jira/browse/FLINK-1032?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14163280#comment-14163280
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ASF GitHub Bot commented on FLINK-1032:
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Github user rmetzger closed the pull request at:
https://github.com/apache/incubator-flink/pull/141
> Extend POJO Field Selectors to Support Accessing Nested Objects
> ---------------------------------------------------------------
>
> Key: FLINK-1032
> URL: https://issues.apache.org/jira/browse/FLINK-1032
> Project: Flink
> Issue Type: Sub-task
> Components: Java API
> Reporter: Aljoscha Krettek
> Assignee: Robert Metzger
>
> Right now you can only use fields of the top-level object as key fields in
> groupings, joins, and co-group. This should be extended to allow using nested
> fields. We have to be careful with null fields, though.
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