Chaoyu Tang created HIVE-11786:
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Summary: 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
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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