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Posted to issues@hive.apache.org by "Konstantin Bereznyakov (Jira)" <ji...@apache.org> on 2026/04/09 22:15:00 UTC

[jira] [Created] (HIVE-29556) StatsUtils::extractNDVGroupingColumns() adjust "unknown" NDVs of "0" to "1"

Konstantin Bereznyakov created HIVE-29556:
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             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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