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https://issues.apache.org/jira/browse/TAJO-483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13865465#comment-13865465
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Hyunsik Choi commented on TAJO-483:
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+1
The change is straightforward and it includes unit tests.
Regarding this issue, a tree data structure, wrapping a directed graph, would
be useful because it provides users with only a simple tree view.
> Add getParentCount(), getParents(), getParent() functions to DirectedGraph
> --------------------------------------------------------------------------
>
> Key: TAJO-483
> URL: https://issues.apache.org/jira/browse/TAJO-483
> Project: Tajo
> Issue Type: Improvement
> Affects Versions: 0.8-incubating
> Reporter: Jihoon Son
> Assignee: Jihoon Son
> Attachments: TAJO-483.patch
>
>
> See the title.
> In the current implementation, DirectedGraph provides only getParent()
> because it assumes that there is only one parent. However, multiple parents
> should be supported in DirectedGraph.
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