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From "Bryan Pendleton (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4371) Non-selected columns for SELECT DISTINCT allowed in ORDER BY clause if ordered by expression
Date Wed, 28 Apr 2010 03:00:33 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12861654#action_12861654
] 

Bryan Pendleton commented on DERBY-4371:
----------------------------------------

There's a bit of a trick to reading the following output:

>  orderby(org.apache.derbyTesting.functionTests.tests.lang.LangScripts)junit.framework.ComparisonFailure:

> Output at line 1736 expected:<[C1 |C2 ]> but was:<[ERROR 42879: The ORDER BY
clause 
> may not contain column 'expression', since the query specifies DISTINCT and that column
does 
> not appear in the query result.]> 

The output is referring to line 1736 in the file 
java/testing/org/apache/derbyTesting/functionTests/master/orderby.out

The "LangScripts" test is a special JUnit test which takes files full of SQL statements, such
as
java/testing/org/apache/derbyTesting/functionTests/tests/lang/orderby.sql, feeds them
into the "ij" tool, and then compares the output against the corresponding XXX.out file.

So have a look at line 1736 in orderby.out and the message should make more sense.

> Non-selected columns for SELECT DISTINCT allowed in ORDER BY clause if ordered by expression
> --------------------------------------------------------------------------------------------
>
>                 Key: DERBY-4371
>                 URL: https://issues.apache.org/jira/browse/DERBY-4371
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.5.1.1
>            Reporter: Bernt M. Johnsen
>            Assignee: C.S. Nirmal J. Fernando
>            Priority: Critical
>         Attachments: DERBY-4371-2.diff, DERBY-4371.diff
>
>
> How to repeat:
> ij> create table t (i integer, j integer);;
> 0 rows inserted/updated/deleted
> ij> insert into t values (1,2),(1,3);
> 2 rows inserted/updated/deleted
> ij> select distinct i from t order by j;
> ERROR 42879: The ORDER BY clause may not contain column 'J', since the query specifies
DISTINCT and that column does not appear in the query result.
> ij> select distinct i from t order by j*2;
> I          
> -----------
> 1          
> 1          
> 2 rows selected

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