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https://issues.apache.org/jira/browse/DERBY-2775?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel John Debrunner reassigned DERBY-2775:
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Assignee: Daniel John Debrunner
> DataTypeDescriptor should be immutable so that multiple ValueNode referring
> to the same DTD do not have unexpected state changes.
> ---------------------------------------------------------------------------------------------------------------------------------
>
> Key: DERBY-2775
> URL: https://issues.apache.org/jira/browse/DERBY-2775
> Project: Derby
> Issue Type: Bug
> Components: Services, SQL
> Reporter: Daniel John Debrunner
> Assignee: Daniel John Debrunner
> Priority: Minor
> Fix For: 10.3.0.0
>
>
> I think that modifying a DTD to change its collation may be pushing the
> envelope of "bug-free" code. If several ValueNode's all refer to a single DTD
> then changing the collation of one changes all of them. This is probably not
> what is required. The setCollation() pattern did copy the existing
> setNullablity() pattern which I think is probably also wrong and subject to
> bugs.
> Changing DTD to be (logically) immutable would be a much better solution,
> e.g. DTD.setNullability() returns a new DTD with the nullability set
> correctly, leaving the old one unmodified. (The method should also have a
> name change, setXXX() is wrong since it is not setting the state of the
> object it is called on). (Also such a method can return the same object if
> the state is unchanged).
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