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https://issues.apache.org/jira/browse/HIVE-11788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14959658#comment-14959658
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Chaoyu Tang commented on HIVE-11788:
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Leaving the columns of db/table/partition name in these stats tables might help
to improve the performance in retrieving stats data. We need update these
columns when doing rename db/table/partition.
> Column stats should be preserved after db/table/partition rename
> ----------------------------------------------------------------
>
> Key: HIVE-11788
> URL: https://issues.apache.org/jira/browse/HIVE-11788
> Project: Hive
> Issue Type: Bug
> Components: Metastore, Statistics
> Reporter: Chaoyu Tang
> Assignee: Chaoyu Tang
>
> Currently we simply delete the column stats after renaming a database, table,
> or partition since there was not an easy way in HMS to update the DB_NAME,
> TABLE_NAME and PARTITION_NAME in TAB_COL_STATS and PART_COL_STATS. With the
> removal of these redundant columns in these tables (HIVE-11786), we will
> still keep column stats in the operation which is not to change a column name
> or type.
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