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From "Siddharth Seth (JIRA)" <>
Subject [jira] [Commented] (HIVE-11786) Deprecate the use of redundant column in colunm stats related tables
Date Tue, 06 Oct 2015 21:49:27 GMT


Siddharth Seth commented on HIVE-11786:

cc [~sershe], and thanks for pointing me to this jira for the perf regression. Reverting just
this patch fixes things.

> Deprecate the use of redundant column in colunm stats related tables
> --------------------------------------------------------------------
>                 Key: HIVE-11786
>                 URL:
>             Project: Hive
>          Issue Type: Bug
>          Components: Metastore
>            Reporter: Chaoyu Tang
>            Assignee: Chaoyu Tang
>             Fix For: 1.3.0, 2.0.0
>         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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