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https://issues.apache.org/jira/browse/HIVE-18685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16367665#comment-16367665
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Eugene Koifman commented on HIVE-18685:
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{quote}9. It is not yet determined what types of cross catalog queries and DML
statements will be supported. The initial version(s) should not do anything
that prevents cross catalog {color:#333333}queries or DML statements in the
future{color}
{quote}
Until this is determined, what will guard against a DML that does cross
catalogs? There is nothing in the above discussion about Lock Managers which
don't understand catalog concept.
> Add catalogs to metastore
> -------------------------
>
> Key: HIVE-18685
> URL: https://issues.apache.org/jira/browse/HIVE-18685
> Project: Hive
> Issue Type: New Feature
> Components: Metastore
> Affects Versions: 3.0.0
> Reporter: Alan Gates
> Assignee: Alan Gates
> Priority: Major
> Attachments: HMS Catalog Design Doc.pdf
>
>
> SQL supports two levels of namespaces, called in the spec catalogs and
> schemas (with schema being equivalent to Hive's database). I propose to add
> the upper level of catalog. The attached design doc covers the use cases,
> requirements, and brief discussion of how it will be implemented in a
> backwards compatible way.
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