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https://issues.apache.org/jira/browse/DERBY-4371?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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C.S. Nirmal J. Fernando updated DERBY-4371:
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Attachment: DERBY-4371.diff
Hi All,
I have attached a patch for this issue. This patch shows following error for
the query mentioned in the description:
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.
I used 'expression' in the error, since j*2 is not a column reference, but I
think it is better if we can show a new error for this.
I am expecting your valuable comments on the patch.
> 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.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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