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https://issues.apache.org/jira/browse/DERBY-716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12476195
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Christian d'Heureuse commented on DERBY-716:
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Part 2 section 9.15 (Execution of multiset-returning functions) Rule 6 states:
"The General Rules of Subclause 9.14 (Execution of array-returning functions)
are applied...".
Therefore Part 13 section 8.5 (Execution of array-returning functions), which
modifies Part 1 section 9.14, indirectly also applies to functions returning
MULTISETs.
> 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
>
> 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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