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https://issues.apache.org/jira/browse/DERBY-5370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13078316#comment-13078316
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Rick Hillegas commented on DERBY-5370:
--------------------------------------

Thanks for that quick response, Brett. In case you haven't stumbled across this 
material yet, a good place to start is 
http://wiki.apache.org/db-derby/DerbyTesting . RestrictedVTITest is a JUnit 
test so the material on JUnit testing is particularly relevant.

> The toSQL method of the org.apache.derby.vti.Restriction class does not 
> output correct constants for VARCHAR, Timestamp, Date, Time, or CHAR FOR BIT 
> DATA types
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-5370
>                 URL: https://issues.apache.org/jira/browse/DERBY-5370
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.8.1.2
>            Reporter: Brett Bergquist
>         Attachments: derby-5370.diff
>
>
> The toSQL method of the org.apache.derby.vti.Restriction class does not 
> output correct constants for VARCHAR, Timestamp, Date, Time, or CHAR FOR BIT 
> DATA types.  This method is useful for building the WHERE clause when 
> implementing a Restricted Table Function.  The result of calling the toSQL 
> method with restrictions on columns of these types does not produce valid SQL 
> constants.  For example with a VARCHAR column being restricted the single 
> quote characters are not placed round the string constant.

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