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https://issues.apache.org/jira/browse/DERBY-4469?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rick Hillegas resolved DERBY-4469.
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Resolution: Fixed
> Fix the CASTing behavior of UDTs
> --------------------------------
>
> Key: DERBY-4469
> URL: https://issues.apache.org/jira/browse/DERBY-4469
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.6.0.0
> Reporter: Rick Hillegas
> Assignee: Rick Hillegas
> Attachments: derby-4469-01-aa-castNullsAndUntypedParameters.diff,
> derby-4469-02-ab-illegalCasts.diff
>
>
> The actual behavior of UDTs, now under construction, does not conform to the
> spec. The spec says that you can't CAST to or from UDTs. This is probably too
> harsh. We should allow the following CAST
> cast ( null as udtType )
> I also think that we should allow at least the implicit casting of subtypes
> to supertypes since Java gives us the ability to discover the type graph. See
> Knut's comment on DERBY-651 on Dec 11, 2009.
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