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Date: Fri, 18 Jun 2010 09:48:24 -0400 (EDT)
From: "Dag H. Wanvik (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Commented: (DERBY-4679) Several left outer joins causes
 unstable query with incorrect results
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    [ https://issues.apache.org/jira/browse/DERBY-4679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12880204#action_12880204 ] 

Dag H. Wanvik commented on DERBY-4679:
--------------------------------------

Sadly, this approach also breaks others queries: they all seem to be characterized by
a mix of inner and outer joins. 

> Several left outer joins causes unstable query with incorrect results
> ---------------------------------------------------------------------
>
>                 Key: DERBY-4679
>                 URL: https://issues.apache.org/jira/browse/DERBY-4679
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.0.2.1, 10.1.1.0, 10.1.2.1, 10.1.3.1, 10.2.1.6, 10.2.2.0, 10.3.1.4, 10.3.2.1, 10.3.3.0, 10.4.1.3, 10.4.2.0, 10.5.1.1, 10.5.2.0, 10.5.3.0, 10.6.1.0
>         Environment: ------------------ Java Information ------------------
> Java Version:    1.5.0
> Java Vendor:     IBM Corporation
> Java home:       C:\jazz-rtc-2.0.0.2\client\eclipse\jdk\jre
> Java classpath:  C:\Progra~1\Derby\Derby10.5.3/lib/derby.jar;C:\Progra~1\Derby\Derby10.5.3/lib/derbynet.jar;C:\Progra~1\Derby\Derby10.5.3/lib/derbyclient.jar;C:\Progra~1\Derby\Derby10.5.3/lib/derbytools.jar
> OS name:         Windows XP
> OS architecture: x86
> OS version:      5.1 build 2600 Service Pack 3
> Java user name:  dirichar
> Java user home:  C:\Documents and Settings\dirichar
> Java user dir:   C:\Program Files\Derby\Derby10.5.3\bin
> java.specification.name: Java Platform API Specification
> java.specification.version: 1.5
> --------- Derby Information --------
> JRE - JDBC: J2SE 5.0 - JDBC 3.0
> [C:\Program Files\Derby\Derby10.5.3\lib\derby.jar] 10.5.3.0 - (802917)
> [C:\Program Files\Derby\Derby10.5.3\lib\derbytools.jar] 10.5.3.0 - (802917)
> [C:\Program Files\Derby\Derby10.5.3\lib\derbynet.jar] 10.5.3.0 - (802917)
> [C:\Program Files\Derby\Derby10.5.3\lib\derbyclient.jar] 10.5.3.0 - (802917)
> ------------------------------------------------------
> ----------------- Locale Information -----------------
> Current Locale :  [English/United States [en_US]]
> Found support for locale: [cs]
> 	 version: 10.5.3.0 - (802917)
> Found support for locale: [de_DE]
> 	 version: 10.5.3.0 - (802917)
> Found support for locale: [es]
> 	 version: 10.5.3.0 - (802917)
> Found support for locale: [fr]
> 	 version: 10.5.3.0 - (802917)
> Found support for locale: [hu]
> 	 version: 10.5.3.0 - (802917)
> Found support for locale: [it]
> 	 version: 10.5.3.0 - (802917)
> Found support for locale: [ja_JP]
> 	 version: 10.5.3.0 - (802917)
> Found support for locale: [ko_KR]
> 	 version: 10.5.3.0 - (802917)
> Found support for locale: [pl]
> 	 version: 10.5.3.0 - (802917)
> Found support for locale: [pt_BR]
> 	 version: 10.5.3.0 - (802917)
> Found support for locale: [ru]
> 	 version: 10.5.3.0 - (802917)
> Found support for locale: [zh_CN]
> 	 version: 10.5.3.0 - (802917)
> Found support for locale: [zh_TW]
> 	 version: 10.5.3.0 - (802917)
> ------------------------------------------------------
>            Reporter: David Richards
>            Assignee: Dag H. Wanvik
>         Attachments: db.sql, derby-4679-followup.diff, derby-4679-followup.stat, derby-4679a.diff, derby-4679a.stat, derby-4679b.diff, derby-4679b.stat, drawing.txt, drawing.txt, equal-after-preprocess.log, Foo.java, in-after-preprocess.log, ins-after-preprocess.log, sample.sql, show.diff, trace-equal.log, trace-exec-plan.log, trace-in.log
>
>
> select distinct 
>     t1.ITEM_ID, 
>     t1.STATE_ID, 
>     t1.JZ_DISCRIMINATOR 
> from (
>     select * 
>     from 
>         LM.ABSTRACT_INSTANCE z1 
>     where 
>         z1.JZ_DISCRIMINATOR = 238
> ) t1 left outer join 
>     LM.LAB_RESOURCE_OPERATINGSYSTEM j1 on (t1.ITEM_ID = j1.JZ_PARENT_ID) left outer join 
>          LM.ABSTRACT_INSTANCE t2 on (j1.ITEM_ID = t2.ITEM_ID) left outer join 
>              LM.OPERATING_SYSTEM_SOFTWARE_INSTALL j2 on (t2.ITEM_ID = j2.JZ_PARENT_ID) left outer join 
>                  LM.ABSTRACT_INSTANCE t3 on (j2.ITEM_ID = t3.ITEM_ID) left outer join 
>                      LM.FAMILY t5 on (t2.FAMILY_ITEM_ID = t5.ITEM_ID) left outer join 
>                          LM.FAMILY t7 on (t1.FAMILY_ITEM_ID = t7.ITEM_ID) 
> where (
>     t3.FAMILY_ITEM_ID  in('_5VetVWTeEd-Q8aOqWJPEIQ') and 
>     (t5.ROOT_ITEM_ID = '_5ZDlwWTeEd-Q8aOqWJPEIQ') and 
>     (t7.ROOT_ITEM_ID = '_5nN9mmTeEd-Q8aOqWJPEIQ') and 
>     (t1.VISIBILITY = 0)
> )
> The above query returns no results despite the fact that the database contains results that match the query.  
> Slight modifications to the query that shouldn't change the outcome cause it to return the expected results.  For example: changing 
> "t3.FAMILY_ITEM_ID  in('_5VetVWTeEd-Q8aOqWJPEIQ')" 
> to 
> "t3.FAMILY_ITEM_ID  in('_5VetVWTeEd-Q8aOqWJPEIQ', 'blah')" 
> or 
> "t3.FAMILY_ITEM_ID  = '_5VetVWTeEd-Q8aOqWJPEIQ'"
> or removing  
> "(t5.ROOT_ITEM_ID = '_5ZDlwWTeEd-Q8aOqWJPEIQ') and "
> despite the fact that the results show that t5.ROOT_ITEM_ID is equal to the string above.
> Note that there is no error message associated with the incorrect query, it just returns zero rows.
> The query below doesn't use join statements and works as expected.
> select distinct 
>    t1.item_id, 
>    t1.state_id, 
>    t1.jz_discriminator
> from (
>         select * 
>         from 
>             lm.abstract_instance z1 
>         where 
>             z1.jz_discriminator = 238
>     ) t1,
>     lm.lab_resource_operatingsystem j1,
>     lm.abstract_instance t3,
>     lm.operating_system_software_install j2,
>     lm.abstract_instance t2,
>     lm.family t5,
>     lm.family t7
> where
>     t1.item_id = j1.jz_parent_id and
>     j1.item_id = t2.item_id and
>     t2.item_id = j2.jz_parent_id and
>     j2.item_id = t3.item_id and
>     t2.family_item_id = t5.item_id and
>     t1.family_item_id = t7.item_id and
>     t3.family_item_id in ('_5VetVWTeEd-Q8aOqWJPEIQ') and
>     t5.root_item_id = '_5ZDlwWTeEd-Q8aOqWJPEIQ' and
>     t7.root_item_id = '_5nN9mmTeEd-Q8aOqWJPEIQ' and
>     t1.visibility = 0;

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