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https://issues.apache.org/jira/browse/DERBY-4371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12900296#action_12900296
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Lily Wei commented on DERBY-4371:
---------------------------------
Hi Nirmal:
I am new to this issue. However, will "select distinct i from t order by
i/j" fits in to 2) collect all columns referenced by the expression in the
OrderByColumn (CollectNodesVisitor could probably do this for you), and check
if all the columns are also in the target's result column list. If they all
are, the OrderByColumn is OK. If not, throw an exception. "j" is not in the
column of target's result column list so we throw an exception.
> 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-4371-4.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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