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https://issues.apache.org/jira/browse/DERBY-4380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12777796#action_12777796
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Knut Anders Hatlen commented on DERBY-4380:
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Then NPE can be triggered with an even simpler query:
create table t(x int);
insert into t values 1;
select 1 from t t1 join t t2 on t1.x in
(select 1 from t a left join t b on 1=0 where b.x=1);
When I look at the query tree after optimization, it looks as if the result
column list for the HalfOuterJoinNode contains a ResultColumn/VirtualColumnNode
chain that ends up in a BaseColumn for B.X, which sounds reasonable since B.X
is needed for the restriction B.X=1. However, the HalfOuterJoinNode's right
child, from which that base column should be retrieved, has a separate chain
that ends up in a different BaseColumn for B.X. I believe that in a correct
tree, the column chain in the HalfOuterJoinNode should be connected to the
chain of its right child, and there should be only one BaseColumn for B.X in
the tree.
> SOME not allowed in ON clause
> -----------------------------
>
> Key: DERBY-4380
> URL: https://issues.apache.org/jira/browse/DERBY-4380
> Project: Derby
> Issue Type: Improvement
> Components: SQL
> Reporter: Bernt M. Johnsen
> Attachments: on_subquery.diff
>
>
> SOME is not allowed in ON-clause:
> ij> create table t1 (i integer);
> 0 rows inserted/updated/deleted
> ij> create table t2 (i integer);
> 0 rows inserted/updated/deleted
> ij> create table t3 (i integer);
> 0 rows inserted/updated/deleted
> ij> insert into t1 values (1);
> 1 row inserted/updated/deleted
> ij> insert into t2 values (2);
> 1 row inserted/updated/deleted
> ij> insert into t3 values 2,3,4;
> 3 rows inserted/updated/deleted
> ij> select * from t1 where t1.i = some (select i from t3);
> I
> -----------
> 0 rows selected
> ij> select * from t1 inner join t2 on t1.i = some (select i from t3);
> ERROR 42972: An ON clause associated with a JOIN operator is not valid.
> ij>
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