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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-6423) The expression syntax in CASE's THEN clause doesn't accept boolean value expression
Date Mon, 05 May 2014 08:11:15 GMT

    [ https://issues.apache.org/jira/browse/DERBY-6423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13989351#comment-13989351
] 

ASF subversion and git services commented on DERBY-6423:
--------------------------------------------------------

Commit 1592465 from [~knutanders] in branch 'code/trunk'
[ https://svn.apache.org/r1592465 ]

DERBY-6423: The expression syntax in CASE's THEN clause doesn't accept boolean value expression

Allow boolean value expressions in CASE and NULLIF expressions.

> The expression syntax in CASE's THEN clause doesn't accept boolean value expression
> -----------------------------------------------------------------------------------
>
>                 Key: DERBY-6423
>                 URL: https://issues.apache.org/jira/browse/DERBY-6423
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>            Reporter: Dag H. Wanvik
>            Assignee: Knut Anders Hatlen
>         Attachments: d6423-1a.diff
>
>
> This syntax gives an error:
>     > VALUES CASE WHEN 1=1 THEN (1=2) OR (3!=4) ELSE true END;
>     ERROR 42X01: Syntax error: Encountered "OR" at line 1, column 33.
> However, this works:
>     > VALUES CASE WHEN 1=1 THEN ((1=2) OR (3!=4)) ELSE true END;
>     1    
>     -----
>     true 
>     1 row selected
> According to the standard, the syntax after THEN should be <result>:
> <result> ::=
>    <result expression>
>    | NULL
> <result expression> ::=
>    <value expression>
> which should give us the full value syntax. sqlgrammar.jj uses the corresponding production
"thenElseExpression" which allows NULL or aditiveExpression. I believe it should be orExpression.



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