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https://issues.apache.org/jira/browse/DERBY-1030?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12784968#action_12784968
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Rick Hillegas commented on DERBY-1030:
--------------------------------------

Committed derby-1030-01-aa-disableOptimization.diff at subversion revision 
886277.

> In some situations a RETURNS NULL ON NULL function is called when one ot its 
> parameters is NULL
> -----------------------------------------------------------------------------------------------
>
>                 Key: DERBY-1030
>                 URL: https://issues.apache.org/jira/browse/DERBY-1030
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.1.2.1
>            Reporter: Daniel John Debrunner
>            Assignee: Rick Hillegas
>         Attachments: derby-1030-01-aa-disableOptimization.diff, 
> derby479.java, derby479.sql
>
>
> The NULL argument to the function has to come from another function and that 
> function's Java method has to return a Java object type corresponding to a 
> fixed length SQL type, such as DATE, TIME and TIMESTAMP.
> Will attach repro scripts.

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