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https://issues.apache.org/jira/browse/HIVE-28800?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Seonggon Namgung updated HIVE-28800:
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Summary: Improve LongColumnStatsAggregator by preventing the overestimation
of NDV (was: Improve LongColumnStatsAggregator by preventing overestimation of
NDV)
> Improve LongColumnStatsAggregator by preventing the overestimation of NDV
> -------------------------------------------------------------------------
>
> Key: HIVE-28800
> URL: https://issues.apache.org/jira/browse/HIVE-28800
> Project: Hive
> Issue Type: Bug
> Reporter: Seonggon Namgung
> Assignee: Seonggon Namgung
> Priority: Minor
>
> When calculating the aggregated column statistics for a long-type column, the
> estimated NDV may sometimes exceed the total number of integers within the
> column’s value range. This estimated value is impossible and could lead to
> incorrect optimization decisions based on the statistics.
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