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http://issues.apache.org/jira/browse/DERBY-280?page=comments#action_12357918 ]
Satheesh Bandaram commented on DERBY-280:
-----------------------------------------
I have submitted this fix to trunk. Please Resolve and Close the bug after
confirming the fix.
I have added a comment to indicate this problem is caused by current parser
rewrite and that any fix to address Derby-681 would make this problem go away.
Rick, I hope you don't mind this comment:
** This issue is caused by parser rewriting of group by/having clauses
** into table expressions. (See function tableExpression() in this file)
** There is an improvement request filed under DERBY-681 to eliminate
this
** rewrite, after which it should be possible to allow multiple columns
to
** have same name in the select list.
Sending java\engine\org\apache\derby\iapi\reference\SQLState.java
Sending java\engine\org\apache\derby\impl\sql\compile\sqlgrammar.jj
Sending java\engine\org\apache\derby\loc\messages_en.properties
Sending
java\testing\org\apache\derbyTesting\functionTests\master\aggregate.out
Sending
java\testing\org\apache\derbyTesting\functionTests\tests\lang\aggregate.sql
Transmitting file data .....
Committed revision 345304.
> Wrong result from select when aliasing to same name as used in group by
> -----------------------------------------------------------------------
>
> Key: DERBY-280
> URL: http://issues.apache.org/jira/browse/DERBY-280
> Project: Derby
> Type: Bug
> Components: SQL
> Reporter: Bernt M. Johnsen
> Assignee: Rick Hillegas
> Priority: Minor
> Attachments: bug280.diff
>
> Wrong result from select when aliasing to same name as used in group by.
> Example:
> If we have the following table:
> ij> select * from tt;
> I |J
> -----------------------
> 1 |2
> 2 |3
> 1 |2
> 2 |3
> 2 |3
>
>
> 5 rows selected
> The following select is ok:
> ij> select i, count(*) as cnt from tt group by i;
> I |CNT
> -----------------------
> 1 |2
> 2 |3
>
>
> 2 rows selected
> But this one returns wrong result in the aliased column:
> ij> select i, count(*) as i from tt group by i;
> I |I
> -----------------------
> 1 |1
> 2 |2
>
>
> 2 rows selected
>
>
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