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https://issues.apache.org/jira/browse/DERBY-6424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13996416#comment-13996416
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Kim Haase commented on DERBY-6424:
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It appears from the syntax in DERBY-6423 (a little hard to figure out because
of what JIRA does with vertical bars), a thenExpression can be either a
valueExpression or NULL. I guess that is also the case for an elseExpression
(which we also don't define).
We define a valueExpression in exactly one place, the "generationClause" topic
under CREATE TABLE, which is the only place it is currently used. I assume I
can use the same definition ("A valueExpression is an expression that resolves
to a single value") -- are there any limitations similar to those in that
topic? The function ones, for example?
> Document thenExpression
> -----------------------
>
> Key: DERBY-6424
> URL: https://issues.apache.org/jira/browse/DERBY-6424
> Project: Derby
> Issue Type: Improvement
> Components: Documentation
> Reporter: Dag H. Wanvik
> Assignee: Kim Haase
>
> The reference manual uses the grammar non-terminal "thenExpression" as a
> place holder for the result of a CASE... THEN <result>, but it is nowhere
> defined.
> When the parent issue DERBY-6423 is fixed, this production should be defined
> accordingly. (The lack of a definition was discovered while investigating
> that issue.)
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