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https://issues.apache.org/jira/browse/DERBY-4372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12755426#action_12755426
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Knut Anders Hatlen commented on DERBY-4372:
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It seems like the problem can be reproduced even without the join. However,
because of DERBY-4376, it is only reproducible this way on 10.2.2.0 and
earlier. On 10.3.1.4 and later, this will go into an infinite loop.
ij> create table t(x int);
0 rows inserted/updated/deleted
ij> insert into t values (8);
1 row inserted/updated/deleted
ij> prepare ps as 'select * from t where x = ? or x = ?';
ij> execute ps using 'values (cast(null as int), 8)';
IJ WARNING: Autocommit may close using result set
X
-----------
8
1 row selected
ij> create index idx on t(x);
0 rows inserted/updated/deleted
ij> execute ps using 'values (cast(null as int), 8)';
IJ WARNING: Autocommit may close using result set
X
-----------
0 rows selected
> 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
> Priority: Critical
>
> 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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