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https://issues.apache.org/jira/browse/HIVE-18328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16327805#comment-16327805
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Naveen Gangam commented on HIVE-18328:
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[~aihuaxu] could you please review this when you get a chance? Thanks
> Improve schematool validator to report duplicate rows for column statistics
> ---------------------------------------------------------------------------
>
> Key: HIVE-18328
> URL: https://issues.apache.org/jira/browse/HIVE-18328
> Project: Hive
> Issue Type: Improvement
> Components: Hive
> Affects Versions: 2.1.1
> Reporter: Naveen Gangam
> Assignee: Naveen Gangam
> Priority: Major
> Attachments: HIVE-18328.patch
>
>
> By design, in the {{TAB_COL_STATS}} table of the HMS schema, there should be
> ONE AND ONLY ONE row, representing its statistics, for each column defined in
> hive. A combination of DB_NAME, TABLE_NAME and COLUMN_NAME constitute a
> primary key/unique row.
> Each time the statistics are computed for a column, this row is updated.
> However, if somehow via BDR/replication process, we end up with multiple
> rows in this table for a given column, HMS server to recompute the statistics
> there after.
> So it would be good to detect this data anamoly via the schema validation
> tool.
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