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https://issues.apache.org/jira/browse/TAJO-628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13910223#comment-13910223
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Hyunsik Choi commented on TAJO-628:
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Created a review request against branch master in reviewboard
https://reviews.apache.org/r/18420/
> The second stage of distinct aggregation can be scheduled to only one node.
> ---------------------------------------------------------------------------
>
> Key: TAJO-628
> URL: https://issues.apache.org/jira/browse/TAJO-628
> Project: Tajo
> Issue Type: Bug
> Components: distributed query plan
> Affects Versions: 0.8-incubating, 1.0-incubating
> Reporter: Hyunsik Choi
> Assignee: Hyunsik Choi
> Priority: Minor
> Attachments: TAJO-628.patch
>
>
> Distinct aggregation requires three stages. But, the second stage can be
> scheduled to one node due to wrong counting of grouping keys.
> This patch fixes this bug. In addition, this patch fixes some trivial bugs in
> Task.java that I found during this debugging.
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