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https://issues.apache.org/jira/browse/SPARK-15777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15541643#comment-15541643
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Yan commented on SPARK-15777:
-----------------------------
A design document is just attached above. We realize that this task requires
significant amount of efforts, and would like to follow community advices on
how to proceed with discussions. If Google Doc is the preferred channel, we
have one version ready over there. Thanks.
> Catalog federation
> ------------------
>
> Key: SPARK-15777
> URL: https://issues.apache.org/jira/browse/SPARK-15777
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Reporter: Reynold Xin
> Attachments: SparkFederationDesign.pdf
>
>
> This is a ticket to track progress to support federating multiple external
> catalogs. This would require establishing an API (similar to the current
> ExternalCatalog API) for getting information about external catalogs, and
> ability to convert a table into a data source table.
> As part of this, we would also need to be able to support more than a
> two-level table identifier (database.table). At the very least we would need
> a three level identifier for tables (catalog.database.table). A possibly
> direction is to support arbitrary level hierarchical namespaces similar to
> file systems.
> Once we have this implemented, we can convert the current Hive catalog
> implementation into an external catalog that is "mounted" into an internal
> catalog.
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