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https://issues.apache.org/jira/browse/DERBY-2258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12468785
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Daniel John Debrunner commented on DERBY-2258:
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Not sure what PRECISION should be for an XML type. It doesn't really have any
meaning, but I bet returning NULL there would not be acceptable. In the various
JDBC docs precision is usually described as number of decimal digits, but also
seems to apply to length of character strings.
> DatabaseMetaData.getTypeInfo() does not list supported Derby SQL types
> correctly.
> ---------------------------------------------------------------------------------
>
> Key: DERBY-2258
> URL: https://issues.apache.org/jira/browse/DERBY-2258
> Project: Derby
> Issue Type: Bug
> Components: JDBC, Network Client
> Affects Versions: 10.1.1.0, 10.1.2.1, 10.1.3.1, 10.2.1.6, 10.2.2.0,
> 10.3.0.0
> Reporter: Daniel John Debrunner
> Assigned To: Saurabh Vyas
> Priority: Minor
> Attachments: Derby-2258.diff, Derby-2258.stat
>
>
> These types are returned but not supported by Derby.
> LONG NVARCHAR
> NATIONAL CHAR
> NATIONAL CHAR VARYING
> The XML type is supported by Derby but not returned.
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