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https://issues.apache.org/jira/browse/DERBY-6634?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Knut Anders Hatlen updated DERBY-6634:
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    Attachment: d6634-3a-impossible-paths.diff

Attaching [^d6634-3a-impossible-paths.diff] which removes some code paths that 
seem to be impossible to reach:

- serializeToString(): Remove check for the items argument being null. All 
callers pass in a non-null List object. By removing the check, we prevent 
potential bugs from going unnoticed (they'll be reported as NPE instead of 
being ignored).

- serializeToString(): Remove code that serializes a list of atomic values. The 
only possible input to the method is a single atomic value or a list of 
document nodes. There's no need for the extra complexity to handle lists of 
atomic values, so remove it.

- serializeToString(): Remove check for the xmlVal argument being null. If 
xmlVal is null where the check is, there is a bug, and reporting it as NPE is 
better than ignoring it.

The regression tests ran cleanly with the patch.

> Improve test coverage of SqlXmlUtil.java
> ----------------------------------------
>
>                 Key: DERBY-6634
>                 URL: https://issues.apache.org/jira/browse/DERBY-6634
>             Project: Derby
>          Issue Type: Improvement
>          Components: Test
>    Affects Versions: 10.11.0.0
>            Reporter: Knut Anders Hatlen
>            Assignee: Knut Anders Hatlen
>            Priority: Minor
>         Attachments: d6634-1a-dead-code.diff, d6634-2a-more-tests.diff, 
> d6634-3a-impossible-paths.diff
>
>
> The test coverage report for SqlXmlUtil indicates that we don't have tests 
> for:
> - recompilation of XML queries used in triggers (the code looks dead, and can 
> probably be removed)
> - serialization of sequences of atomic values returned by an XPath query (as 
> far as I can see, we only support single atomic values and sequences of 
> documents, so probably that's also code that can be removed, possibly 
> replaced by an assert)
> - XMLEXISTS operations where the XPath query returns a scalar (after 
> DERBY-6624, it will take the same code path as a query that returns a 
> non-empty sequence, so it won't show up in the report anymore, but it's still 
> useful to have a test case for it)
> - XMLQUERY operations where the XPath query returns a boolean (after 
> DERBY-6624, the same code path will be taken for all data types, so it won't 
> show up in the report anymore, but it's still useful to have a test case for 
> it)



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