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https://issues.apache.org/jira/browse/DERBY-4372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12761509#action_12761509
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Knut Anders Hatlen commented on DERBY-4372:
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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
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