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From "Dag H. Wanvik (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4391) NullPointerException when comparing indexed column with result from a set operation
Date Tue, 13 Oct 2009 02:05:31 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12764923#action_12764923

Dag H. Wanvik commented on DERBY-4391:

> perhaps bulk-fetching is disabled when we have a correlated sub-query in the predicate

I don't know, but even if it is, I think it is more convoluted to rely on that when pruning
subquery visits.
So, your present patch in view of this is fine. 


Btw, I saw this inside setUnionResultExpression

 /* DB2 requires both sides of union to have same name for the result to
  * have that name. Otherwise, leave it or set it to a generated name */

Wonder what the standard says about this? (I came across it when playing with Bryan's patch
for DERBY-4).

> NullPointerException when comparing indexed column with result from a set operation
> -----------------------------------------------------------------------------------
>                 Key: DERBY-4391
>                 URL: https://issues.apache.org/jira/browse/DERBY-4391
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions:,,,,
>            Reporter: Knut Anders Hatlen
>            Assignee: Knut Anders Hatlen
>         Attachments: d4391-1a.diff, d4391-1a.stat
> I'm reporting this issue on behalf of Bernt M. Johnsen.
> If an indexed column is compared with a UNION query (or some other set operation), a
NullPointerException is raised, as can be seen by this sequence of statements in ij:
> ij> create table t(a int not null primary key, b int);
> 0 rows inserted/updated/deleted
> ij> select * from t where a < (values 4 union values 4);
> ERROR XJ001: Java exception: ': java.lang.NullPointerException'.

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