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From "A B (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-2459) Ordering on a CASE-expression casues a NullPointerException when using a UNION
Date Fri, 16 Mar 2007 15:24:09 GMT

     [ https://issues.apache.org/jira/browse/DERBY-2459?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

A B updated DERBY-2459:
-----------------------

    Affects Version/s: 10.3.0.0
                       10.1.3.2
                       10.1.3.1
                       10.2.1.6
                       10.2.2.0

I confirmed this bug with ibm142 against the latest trunk with the following stack trace:

java.lang.NullPointerException
	at org.apache.derby.impl.sql.compile.OrderByColumn.bindOrderByColumn(OrderByColumn.java:179)
	at org.apache.derby.impl.sql.compile.OrderByList.bindOrderByColumns(OrderByList.java:153)
	at org.apache.derby.impl.sql.compile.CursorNode.bindStatement(CursorNode.java:266)
	at org.apache.derby.impl.sql.GenericStatement.prepMinion(GenericStatement.java:314)
	at org.apache.derby.impl.sql.GenericStatement.prepare(GenericStatement.java:88)
	at org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.prepareInternalStatement(GenericLanguageConnectionContext.java:741)
	at org.apache.derby.impl.jdbc.EmbedStatement.execute(EmbedStatement.java:567)
	at org.apache.derby.impl.jdbc.EmbedStatement.execute(EmbedStatement.java:516)
	at org.apache.derby.impl.tools.ij.ij.executeImmediate(ij.java:320)
	at org.apache.derby.impl.tools.ij.utilMain.doCatch(utilMain.java:516)
	at org.apache.derby.impl.tools.ij.utilMain.runScriptGuts(utilMain.java:369)
	at org.apache.derby.impl.tools.ij.utilMain.go(utilMain.java:267)
	at org.apache.derby.impl.tools.ij.Main.go(Main.java:203)
	at org.apache.derby.impl.tools.ij.Main.mainCore(Main.java:169)
	at org.apache.derby.impl.tools.ij.Main14.main(Main14.java:56)
	at org.apache.derby.tools.ij.main(ij.java:71)

I also ran it against 10.1 and the same problem occurs there.  So I'm adding a couple of entries
to the "Affects version" box.

Thank you for filing this issue, Lars.

> Ordering on a CASE-expression casues a NullPointerException when using a UNION
> ------------------------------------------------------------------------------
>
>                 Key: DERBY-2459
>                 URL: https://issues.apache.org/jira/browse/DERBY-2459
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.1.3.1, 10.1.3.2, 10.2.1.6, 10.2.2.0, 10.2.2.1, 10.3.0.0
>         Environment: Java 1.5.0_06-b05 on Linux Ubuntu 5.10. Derby version 10.2.2
>            Reporter: Lars Gråmark
>
> When an order by clause involves a CASE-expression as seen below, a NullPointerException
is thrown. The error only occurs when two select statements are combined in a union (or union
all).
> select t1.id, CASE WHEN t2.value IS NOT NULL THEN t2.value ELSE t1.value END
> from A1 t1
> left outer join B1 t2 ON t2.id = t1.ref
> union all
> select t1.id, CASE WHEN t2.value IS NOT NULL THEN t2.value ELSE t1.value END
> from A2 t1
> left outer join B2 t2 ON t2.id = t1.ref
> order by CASE WHEN t2.value IS NOT NULL THEN t2.value ELSE t1.value END
> --Use the following statement to reproduce the problem:
> create table A1
> (
>    id char(1)
>   ,value int
>   ,ref char(1)
> );
> create table A2
> (
>    id char(1)
>   ,value int
>   ,ref char(1)
> );
> create table B1
> (
>    id char(1)
>   ,value int
> );
> create table B2
> (
>    id char(1)
>   ,value int
> );
> insert into A1 (id, value, ref) values ('a', 12, 'e');
> insert into A1 (id, value, ref) values ('b', 1, null);
> insert into A2 (id, value, ref) values ('c', 3, 'g');
> insert into A2 (id, value, ref) values ('d', 8, null);
> insert into B1 (id, value) values ('e', 4);
> insert into B1 (id, value) values ('f', 2);
> insert into B2 (id, value) values ('g', 5);

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