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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-4513) Forbid NEXT VALUE FOR clause in certain contexts
Date Wed, 10 Feb 2010 14:24:28 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4513?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Rick Hillegas updated DERBY-4513:

    Attachment: derby-4513_01-ab-illegalContexts.diff

Thanks for looking at the patch, Knut. I don't know what's going on. I did notice merge errors
when I resynced this patch client with the trunk. I've brought the patch up-to-date with the
head of the trunk and am attaching a merged revision: derby-4513_01-ab-illegalContexts.diff

Here's what I see with this patch when I run your experiment:

ij version 10.6
ij> connect 'jdbc:derby:memory:dummy;create=true';
ij> create sequence s;
0 rows inserted/updated/deleted
ij> select * from sysibm.sysdummy1 where (next value for s) < 4;
ERROR 42XAH: A NEXT VALUE FOR expression may not appear in many contexts, including WHERE,
functions and CHECK constraints.

Let me know if this still doesn't fix the problem. Thanks.

> 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:
>            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

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