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https://issues.apache.org/jira/browse/DERBY-6423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13835775#comment-13835775
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Knut Anders Hatlen commented on DERBY-6423:
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We fixed some similar problems in DERBY-5972. CASE expressions were discussed,
but only the WHEN clause. The THEN and ELSE clauses were overlooked, apparently.
> 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
>
> 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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