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Type:
Bug
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Status: Closed
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Priority:
Minor
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Resolution: Fixed
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Affects Version/s: None
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Fix Version/s: 2.2.0
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Component/s: Query Processor
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Labels:
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Target Version/s:
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Release Note:hive.cbo.show.warnings (default false) is added to control display of cost-based-optimizer compiler warnings, like missing stats.
Many Hive performance issues are due to missing statistics. Either all, table or column statistics are missing. Potentially a new partition has been added and customer forgot to gather stats for that partition.
A simple warning about a table or column missing statistics can be very helpful and makes hive more user friendly. Hive already has this information, its a matter of printing it out.