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https://issues.apache.org/jira/browse/FLINK-2689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14791782#comment-14791782
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ASF GitHub Bot commented on FLINK-2689:
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Github user mxm commented on the pull request:
https://github.com/apache/flink/pull/1136#issuecomment-141003929
LGTM
> Reusing null object for joins with SolutionSet
> ----------------------------------------------
>
> Key: FLINK-2689
> URL: https://issues.apache.org/jira/browse/FLINK-2689
> Project: Flink
> Issue Type: Bug
> Components: Local Runtime
> Affects Versions: 0.9, 0.10
> Reporter: Fabian Hueske
> Assignee: Fabian Hueske
> Fix For: 0.10, 0.9.2
>
>
> Joins and CoGroups with a solution set have outer join semantics because a
> certain key might not have been inserted into the solution set yet. When
> probing a non-existing key, the CompactingHashTable will return null.
> In object reuse mode, this null value is used as reuse object when the next
> key is probed.
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