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https://issues.apache.org/jira/browse/DERBY-4513?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rick Hillegas closed DERBY-4513.
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> Forbid NEXT VALUE FOR clause in certain contexts
> ------------------------------------------------
>
> Key: DERBY-4513
> URL: https://issues.apache.org/jira/browse/DERBY-4513
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.6.1.0
> Reporter: Rick Hillegas
> Assignee: Rick Hillegas
> Attachments: derby-4513_01-aa-illegalContexts.diff,
> derby-4513_01-ab-illegalContexts.diff
>
>
> This is part of the work needed to implement ANSI/ISO sequences. The
> functional spec attached to DERBY-712 lists various situations in which the
> NEXT VALUE FOR clause is illegal. These include:
> * CASE expression
> * WHERE clause
> * ORDER BY clause
> * AGGREGATE expression
> * WINDOW function
> * DISTINCT select list
> In addition, I propose that we make it illegal for a statement to have more
> than one NEXT VALUE FOR clause on the same sequence generator. This is a
> tighter restriction than the ANSI/ISO standard calls for. The standard
> requires that if two columns in a row are populated by NEXT VALUE FOR clauses
> on the same sequence, then the values should be the same. I don't feel
> confident that I could track down all of the cases which could give rise to
> this situation--so I propose to limit the number of NEXT VALUE FOR clauses on
> a given sequence generator to just 1.
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