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https://issues.apache.org/jira/browse/HIVE-22728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17038349#comment-17038349
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Miklos Gergely commented on HIVE-22728:
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Merged to master, thanks [~kgyrtkirk]
> Limit the scope of uniqueness of constraint name to table
> ---------------------------------------------------------
>
> Key: HIVE-22728
> URL: https://issues.apache.org/jira/browse/HIVE-22728
> Project: Hive
> Issue Type: Wish
> Reporter: Jesus Camacho Rodriguez
> Assignee: Miklos Gergely
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-22728.01.patch, HIVE-22728.02.patch,
> HIVE-22728.04.patch
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Currently, constraint names are globally unique across all databases
> (assumption is that this may have done by design). Nevertheless, though
> behavior seems to be implementation specific, it would be interesting to
> limit the scope to uniqueness per table.
> To change the scope to one table, we would need to add the PARENT_TABLE_ID in
> the KEY_CONSTRAINTS table to the PRIMARY KEY of that table. Some minor
> changes to the error messages would be needed too, since otherwise it would
> be difficult to identify the correct violation in queries that span across
> multiple databases. Additionally, the SQL scripts will need to be updated to
> update the PRIMARY KEY.
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