Details
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Bug
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Status: Closed
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Minor
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Resolution: Fixed
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None
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hive.cbo.show.warnings (default false) is added to control display of cost-based-optimizer compiler warnings, like missing stats.
Description
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.