Konstantin Bereznyakov created HIVE-29556: ---------------------------------------------
Summary: StatsUtils::extractNDVGroupingColumns() adjust "unknown"
NDVs of "0" to "1"
Key: HIVE-29556
URL: https://issues.apache.org/jira/browse/HIVE-29556
Project: Hive
Issue Type: Bug
Reporter: Konstantin Bereznyakov
The side effect of this is a potentially severe under-estimation of the number
of GROUP BY result rows
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