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From "Dag H. Wanvik (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DERBY-3256) Derby's reserved keyword list does not agree with either the SQL 92 or SQL 2003 standards
Date Sun, 09 Sep 2012 23:20:07 GMT

     [ https://issues.apache.org/jira/browse/DERBY-3256?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dag H. Wanvik updated DERBY-3256:
---------------------------------

    Attachment: derbykeywords-1.stat
                derbykeywords-1.diff

Here is a proof-of-concept patch that scrapes the reserved and unreserved keywords that Derby
uses from the sqlgrammar.jj file, generates a class Keywords.java and uses the generated string
arrays in that class to make a diagnostic table function to be used as:

   select * from table(syscs_diag.derby_keywords('reserved')) t order by keyword

or 
  
   select * from table(syscs_diag.derby_keywords('unreserved')) t order by keyword

It also adds a test to SysDiagVTIMappingTest: testDerbyKeywords

                
> Derby's reserved keyword list does not agree with either the SQL 92 or SQL 2003 standards
> -----------------------------------------------------------------------------------------
>
>                 Key: DERBY-3256
>                 URL: https://issues.apache.org/jira/browse/DERBY-3256
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 10.3.1.4
>            Reporter: Rick Hillegas
>         Attachments: derbykeywords-1.diff, derbykeywords-1.stat, keywords.tar
>
>
> According to the comments in sqlgrammar.jj, Derby's understanding of reserved vs. non-reserved
keywords is supposed to be based on SQL 92. However, Derby has 8 reserved keywords which are
not part of the SQL 92 list of reserved keywords. The SQL 2003 spec moved many of the SQL
92 reserved keywords to the non-reserved list. Derby has 55 reserved keywords which are not
part of the SQL 2003 list. 42 of Derby's reserved keywords are in the SQL 2003 list of non-reserved
keywords.
> The reserved keywords create migration problems when moving applications from other databases
to Derby. We should consider whether there is any reason that Derby should have more reserved
keywords than appear in the SQL 2003 standard.

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