Zoltan Haindrich created HIVE-18523:
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Summary: Fix summary row in case there are no inputs
Key: HIVE-18523
URL: https://issues.apache.org/jira/browse/HIVE-18523
Project: Hive
Issue Type: Bug
Reporter: Zoltan Haindrich
HIVE-17617 added a fix to handle empty groups correctly; however it might be
possible that the summary row is returned multiple times - in case the mappers
are "seem" to be optimized away...
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