[
https://issues.apache.org/jira/browse/HIVE-11786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14791143#comment-14791143
]
Sergey Shelukhin commented on HIVE-11786:
-----------------------------------------
Left some comments on RB. The test failures (except HCat and streaming) may be
related.
> 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.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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
