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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 Sat, 26 Aug 2006 23:47:23 GMT
     [ http://issues.apache.org/jira/browse/DERBY-1681?page=all ]

Mike Matrigali updated DERBY-1681:
----------------------------------


I will look at committing these test changes to trunk and 10.2

> 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: 10.2.1.0, 10.1.3.0, 10.1.3.1
>            Reporter: A B
>         Assigned To: A B
>             Fix For: 10.2.1.0, 10.1.4.0
>
>         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 10.1.2.4 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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