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https://issues.apache.org/jira/browse/HIVE-12763?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pengcheng Xiong updated HIVE-12763:
-----------------------------------
Fix Version/s: 2.1.0
> Use bit vector to track NDV
> ---------------------------
>
> Key: HIVE-12763
> URL: https://issues.apache.org/jira/browse/HIVE-12763
> Project: Hive
> Issue Type: Improvement
> Affects Versions: 1.2.0, 1.2.1
> Reporter: Pengcheng Xiong
> Assignee: Pengcheng Xiong
> Fix For: 2.1.0
>
> Attachments: HIVE-12763.01.patch, HIVE-12763.02.patch,
> HIVE-12763.03.patch, HIVE-12763.04.patch, HIVE-12763.05.patch,
> aggrStatsPerformance.png, performanceOfMergingNDV.png
>
>
> This will improve merging of per partitions stats. It will also help merge
> NDV for auto-gather column stats.
> !aggrStatsPerformance.png|thumbnail!
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