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