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From "Bryan Pendleton (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2351) ORDER BY with expression with distinct in the select list returns incorrect result
Date Fri, 07 Mar 2008 04:24:58 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12576033#action_12576033
] 

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

Thanks Thomas and Army for investigating the behavior of other DB's. 
This is encouraging, for it seems to substantiate our understanding
of how the binding rules ought to behave.

Another unresolved question involves the queries in DERBY-3373; it
would be nice to construct a patch which solved those problems as well.
However, the problem in DERBY-3373 is rather different than the ones
we've been discussing here recently, as it doesn't involve aliasing, but
rather involves the difference between an expression which refers to a
column, and a simple direct column reference.

> 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: 10.2.1.6, 10.2.2.0, 10.3.1.4
>         Environment: Any
>            Reporter: Yip Ng
>            Assignee: Bryan Pendleton
>             Fix For: 10.3.2.2, 10.4.0.0
>
>         Attachments: d2351_aliasing.diff, d2351_aliasing.diff, d2351_aliasing_checkQualifiedName.diff,
derby_2351.diff, derby_2351_v2.diff, reproTests.diff
>
>
> 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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