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https://issues.apache.org/jira/browse/DERBY-716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12511566
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Rick Hillegas commented on DERBY-716:
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Thanks for taking a look at this patch, Dan. I think that isRowMultiSet() could
be removed from TypeDescriptor. It's in there so that AliasDescriptor doesn't
have to cast a TypeDescriptor to DataTypeDescriptor. I'm comfortable with that
cast and agree that isRowMutliSet() looks awkward in TypeDescriptorImpl.
> Re-enable VTIs
> --------------
>
> Key: DERBY-716
> URL: https://issues.apache.org/jira/browse/DERBY-716
> Project: Derby
> Issue Type: New Feature
> Components: SQL
> Reporter: Rick Hillegas
> Assignee: Rick Hillegas
> Attachments: derby-716-01-basic-aa.diff, functionTables.html,
> functionTables.html, functionTables.html
>
>
> Cloudscape used to expose Virtual Table Interfaces, by which any class which
> implemented ResultSet could be included in a query's FROM list. Derby still
> exposes a number of these VTIs as diagnostic tools. However, Derby now
> prevents customers from declaring their own VTIs. The parser raises an error
> if a VTI's package isn't one of the Derby diagnostic packages.
> This is a very powerful feature which customers can use to solve many
> problems. We should discuss the reasons that it was disabled and come up with
> a plan for putting this power back into our customers' hands.
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