Hyunsik Choi created TAJO-628:
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Summary: 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
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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