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https://issues.apache.org/jira/browse/DERBY-3349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12564159#action_12564159
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Thomas Nielsen commented on DERBY-3349:
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There are 4 more variations of problematic queries in the
'derby-3301-extra.sql' script attached to DERBY-3301.
> Nested WHERE EXISTS queries need improved testing
> -------------------------------------------------
>
> Key: DERBY-3349
> URL: https://issues.apache.org/jira/browse/DERBY-3349
> Project: Derby
> Issue Type: Improvement
> Components: Test
> Reporter: Thomas Nielsen
>
> DERBY-3301 reported an error in subquery flattening of nested WHERE EXISTS
> clauses, or WHERE EXISTS subqueries. The query returned the wrong number of
> rows.
> There is currently some tests for WHERE EXISTS, but none for nested WHERE
> EXISTS clauses.
> See DERBY-3301 for a full sql repro.
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