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Posted to issues@flink.apache.org by "Fabian Hueske (JIRA)" <ji...@apache.org> on 2015/09/16 17:05:45 UTC

[jira] [Created] (FLINK-2689) Reusing null object for joins with SolutionSet

Fabian Hueske created FLINK-2689:
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             Summary: 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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