[TAJO-628] The second stage of distinct aggregation can be scheduled to only one node.

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.8.0, 0.9.0
• Fix Version/s: 0.8.0, 0.9.0
• Component/s: distributed query plan
• Assignee: Hyunsik Choi
• Reporter: Hyunsik Choi
• Created: 24/Feb/14 09:41
• Updated: 24/Feb/14 16:49
• Resolved: 24/Feb/14 16:44

Description

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.