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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4372) Wrong result for simple join when index is created
Date Thu, 17 Sep 2009 15:34:57 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12756583#action_12756583
] 

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

Um, well... Running the tests may not help that much. According to the test coverage report,
the BaseExpressionActivation class isn't used at all by the JUnit tests: http://dbtg.foundry.sun.com/derby/test/coverage/jvm1.6/sol/suitesAll82289/_files/3b1.html.
I guess the MultiProbeTableScanResultSet added in DERBY-47 makes it less likely that this
code path is used.

The lack of test coverage probably means the answer to your question ("Are [the] methods used
widely?") is no...

I'll run the experiment anyway, since there may be tests in derbyall that exercise the code
path.

> 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
>         Attachments: derby-4372-1a.diff, derby-4372-1a.stat
>
>
> 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

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