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From "Mike Matrigali (JIRA)" <derby-...@db.apache.org>
Subject [jira] Updated: (DERBY-1681) Regression (wrong results): Join predicate can be ignored for left-most child in a chain of nested unions.
Date Mon, 28 Aug 2006 00:35:23 GMT
     [ http://issues.apache.org/jira/browse/DERBY-1681?page=all ]

Mike Matrigali updated DERBY-1681:

backported and committed patch d1681_test_v2.patch from trunk to 10.2 branch:

r437487 | mikem | 2006-08-27 17:34:07 -0700 (Sun, 27 Aug 2006) | 14 lines

merging change 437380 from trunk to 10.2 branch:

contributed by Army Brown

Adding extra tests for this issue, fix already committed.

Note that the test cases which were added for DERBY-1633 actually already
demonstrate the problem reported (and now fixed) in this issue. This checkin
is a dedicated test case for this issue.

> Regression (wrong results): Join predicate can be ignored for left-most child in a chain
of nested unions.
> ----------------------------------------------------------------------------------------------------------
>                 Key: DERBY-1681
>                 URL: http://issues.apache.org/jira/browse/DERBY-1681
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions:,,
>            Reporter: A B
>         Assigned To: A B
>             Fix For:,
>         Attachments: d1681_test.patch, d1681_test_v2.patch, d1681_v1.patch, DERBY-1681_v1.html
> If Derby chooses to do a join between two FromTables and the right table is a chain of
UNIONs, then the optimizer may choose to push the join predicate (if provided) down into the
UNION and to both children of every UNION in the chain.  But if the predicate cannot be pushed
to the children of any of the UNIONs (except the top-level one)  the predicate can end up
being ignored altogether with respect to that UNION's children.  The result is that query
execution can return rows that do not satisfy the predicate.
> This is a regression introduced in and thus it affects 10.1.3 and 10.2.  I came
across this while tracing through code for DERBY-1633.

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