db-derby-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
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 Tue, 29 Aug 2006 18:26:26 GMT
     [ http://issues.apache.org/jira/browse/DERBY-1681?page=all ]

Mike Matrigali updated DERBY-1681:

    Fix Version/s:     (was:
       Derby Info: [Patch Available, Existing Application Impact, Regression]  (was: [Regression,
Existing Application Impact])

I fixed the typo's that I could see, if there are any others let me know.  Not a svn expert,
you may have to svn update to see changes - not sure.  Easiest if you give the svn rev number
of the problem log,  it is very easy to edit them:  ie. svn propedit svn:log --revprop -r
437487, pops you into an edit window like svn commit.

> 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.

This message is automatically generated by JIRA.
If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira


View raw message