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https://issues.apache.org/jira/browse/DERBY-3349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12563229#action_12563229
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Thomas Nielsen commented on DERBY-3349:
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DERBY-3301 adds a test with two variations over the repro script, but there are
other combinations that needs testing:
Army> I think a minimal list of combinations to check should be:
Army > * WHERE EXISTS ... WHERE EXISTS (done with test-1.diff -- thanks!)
Army > * WHERE EXISTS ... WHERE IN (done with test-2.diff -- thanks!)
Army > * WHERE EXISTS .. WHERE ANY
Army > * WHERE IN ... WHERE IN (I posted an example in my previous post, but
it's not included in the tests)
Army > * WHERE ANY ... WHERE ANY
> 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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