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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-4513) Forbid NEXT VALUE FOR clause in certain contexts
Date Tue, 12 Jan 2010 18:35:54 GMT
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: 10.6.0.0
            Reporter: Rick Hillegas


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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