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https://issues.apache.org/jira/browse/SPARK-24814?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17301038#comment-17301038
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Bruce Robbins commented on SPARK-24814:
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Very old Jira, now obsolete.
> Relationship between catalog and datasources
> --------------------------------------------
>
> Key: SPARK-24814
> URL: https://issues.apache.org/jira/browse/SPARK-24814
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Bruce Robbins
> Priority: Major
>
> This is somewhat related, though not identical to, [~rdblue]'s SPIP on
> datasources and catalogs.
> Here are the requirements (IMO) for fully implementing V2 datasources and
> their relationships to catalogs:
> # The global catalog should be configurable (the default can be HMS, but it
> should be overridable).
> # The default catalog (or an explicitly specified catalog in a query, once
> multiple catalogs are supported) can determine the V2 datasource to use for
> reading and writing the data.
> # Once multiple catalogs are supported, a user should be able to specify a
> catalog on spark.read and df.write operations. As specified above, The
> catalog would determine the datasource to use for the read or write operation.
> Old #3:
> -Conversely, a V2 datasource can determine which catalog to use for
> resolution (e.g., if the user issues
> {{spark.read.format("acmex").table("mytable")}}, the acmex datasource would
> decide which catalog to use for resolving “mytable”).-
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