Thanks, Satheesh!
Satheesh Bandaram (JIRA) wrote:
[ 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
