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From "Daniel John Debrunner (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-716) Re-enable VTIs
Date Tue, 10 Jul 2007 20:06:05 GMT

    [ https://issues.apache.org/jira/browse/DERBY-716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12511554
] 

Daniel John Debrunner commented on DERBY-716:
---------------------------------------------

Is there a need to add isRowMultiSet() to TypeDescriptor? It looks out of place in that interface.
All the other isRowMultiSet() methods are on TypeId, and in fact the DataTypeDescriptor.isRowMultiSet()
just calls the TypeId method.
Also the TypeDescriptorImpl version just returns false which looks wrong, or an indication
the method should not be on TypeDescriptor.

> 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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