[jira] Commented: (DERBY-4371) Non-selected columns for SELECT DISTINCT allowed in ORDER BY clause if ordered by expression

["C.S. Nirmal J. Fernando (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DERBY-4371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12863315#action_12863315 ] 

C.S. Nirmal J. Fernando commented on DERBY-4371:
------------------------------------------------

Thanks Knut, for reviewing the patch, yes me too felt that it is too generic and thanks for suggesting me possible two ways, that was really helpful. I think the most appropriate way is the second way, since we want queries like select distinct c1, c2 from t1 order by c1+1 to be valid.

The patch DERBY-4371-4.diff contains the new modifications. Highly appreciate reviews from all of you. Thanks.

I am now running the tests.

> 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-4371-3.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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