db-derby-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4372) Wrong result for simple join when index is created
Date Fri, 02 Oct 2009 08:39:23 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12761509#action_12761509
] 

Knut Anders Hatlen commented on DERBY-4372:
-------------------------------------------

This bug also affects older versions, so it certainly can be back-ported if someone wants
the fix on those branches.

> Wrong result for simple join when index is created
> --------------------------------------------------
>
>                 Key: DERBY-4372
>                 URL: https://issues.apache.org/jira/browse/DERBY-4372
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.5.1.1
>            Reporter: Bernt M. Johnsen
>            Assignee: Knut Anders Hatlen
>            Priority: Critical
>             Fix For: 10.5.3.1, 10.6.0.0
>
>         Attachments: derby-4372-1a.diff, derby-4372-1a.stat, experiment.diff
>
>
> In the example below, the first SELECT has correct result. After the index is created,
the second SELECT gives wrong result.
> ij> CREATE TABLE t1 (i1 INT, j1 INT);
> 0 rows inserted/updated/deleted
> ij> CREATE TABLE t2 (i2 INT, j2 INT);
> 0 rows inserted/updated/deleted
> ij> INSERT INTO t1 VALUES (8, 8),(NULL, 8);
> 2 rows inserted/updated/deleted
> ij> INSERT INTO t2 VALUES (8, 8);
> 1 row inserted/updated/deleted
> ij> SELECT * FROM t1 INNER JOIN t2 ON (t2.j2 = t1.i1) OR (t2.j2 = t1.j1);
> I1         |J1         |I2         |J2         
> -----------------------------------------------
> 8          |8          |8          |8          
> NULL       |8          |8          |8          
> 2 rows selected
> ij> CREATE INDEX ix2 ON t2(j2);
> 0 rows inserted/updated/deleted
> ij> SELECT * FROM t1 INNER JOIN t2 ON (t2.j2 = t1.i1) OR (t2.j2 = t1.j1);
> I1         |J1         |I2         |J2         
> -----------------------------------------------
> 8          |8          |8          |8          
> 1 row selected

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message