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https://issues.apache.org/jira/browse/DERBY-6560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13987816#comment-13987816
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Knut Anders Hatlen commented on DERBY-6560:
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I'm fine with not backporting it. It's just a minor problem, so it's probably
not worth putting more effort into it now that it's fixed on trunk.
> Reference manual says ELSE clause is required in CASE expressions
> -----------------------------------------------------------------
>
> Key: DERBY-6560
> URL: https://issues.apache.org/jira/browse/DERBY-6560
> Project: Derby
> Issue Type: Bug
> Components: Documentation
> Affects Versions: 10.10.2.0
> Reporter: Knut Anders Hatlen
> Assignee: Kim Haase
> Priority: Minor
> Fix For: 10.11.0.0
>
> Attachments: DERBY-6560.diff, rrefcase.html
>
>
> The reference manual topic on the CASE expression says the syntax is
> {noformat}
> CASE
> WHEN booleanExpression THEN thenExpression
> [ WHEN booleanExpression THEN thenExpression ]*
> ELSE elseExpression
> END
> {noformat}
> The ELSE clause is optional and should be in square brackets, as seen by this
> example:
> {noformat}
> ij> values case when (1<>1) then 'yes' end;
> 1
> ----
> NULL
> 1 row selected
> {noformat}
> This seems to comply with the SQL standard, as the syntax rules for <case
> expression> say that "\[if\] an <else clause> is not specified, then ELSE
> NULL is implicit."
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