[jira] Commented: (DERBY-2351) ORDER BY with expression with distinct in the select list returns incorrect result

["Bryan Pendleton (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DERBY-2351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12473862 ] 

Bryan Pendleton commented on DERBY-2351:
----------------------------------------

Hi Yip. I haven't spent any time looking at this yet, just wanted to mention a hunch that this might be related to DERBY-1861. If you apply the patch for DERBY-1861, does the behavior change at all?


> ORDER BY with expression with distinct in the select list returns incorrect result
> ----------------------------------------------------------------------------------
>
>                 Key: DERBY-2351
>                 URL: https://issues.apache.org/jira/browse/DERBY-2351
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.2.2.0, 10.3.0.0
>         Environment: Any
>            Reporter: Yip Ng
>
> When distinct is in the select list and the query has order by with expression, the resultset produced contains an additional column.  
> ij> create table t1 (c1 int, c2 varchar(10))
> 0 rows inserted/updated/deleted
> ij> insert into t1 values (1,'a'),(2,'b'),(3,'c');
> 3 rows inserted/updated/deleted
> select distinct c1, c2 from t1 order by c1;
> C1         |C2
> ----------------------
> 1          |a
> 2          |b
> 3          |c
> 3 rows selected
> ij> select distinct c1, c2 from t1 order by c1+1;
> C1         |C2        |3                                 <=====returns 3 columns, incorrect result returned
> ----------------------------------
> 1          |a         |2
> 2          |b         |3
> 3          |c         |4
> 3 rows selected

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