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https://issues.apache.org/jira/browse/HIVE-11786?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chaoyu Tang updated HIVE-11786:
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Attachment: HIVE-11786.2.patch
attached a new rebased patch. [~sershe], [~ashutoshc], and [~xuefuz], could
you review the patch and let me know if there is any issue to remove these
columns from TAB_COL_STATS/PART_COL_STATS? Using a join via K/FKey instead a
direct query to these tables I think should not be a big concern to the
performance.
HIVE-11788 is depending on this JIRA. Otherwise, I need look for other ways to
fix HIVE-11788. Thanks
> Deprecate the use of redundant column in colunm stats related tables
> --------------------------------------------------------------------
>
> Key: HIVE-11786
> URL: https://issues.apache.org/jira/browse/HIVE-11786
> Project: Hive
> Issue Type: Bug
> Components: Metastore
> Reporter: Chaoyu Tang
> Assignee: Chaoyu Tang
> Attachments: HIVE-11786.1.patch, HIVE-11786.1.patch,
> HIVE-11786.2.patch, HIVE-11786.patch
>
>
> The stats tables such as TAB_COL_STATS, PART_COL_STATS have redundant columns
> such as DB_NAME, TABLE_NAME, PARTITION_NAME since these tables already have
> foreign key like TBL_ID, or PART_ID referencing to TBLS or PARTITIONS.
> These redundant columns violate database normalization rules and cause a lot
> of inconvenience (sometimes difficult) in column stats related feature
> implementation. For example, when renaming a table, we have to update
> TABLE_NAME column in these tables as well which is unnecessary.
> This JIRA is first to deprecate the use of these columns at HMS code level. A
> followed JIRA is to be opened to focus on DB schema change and upgrade.
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