[ http://issues.apache.org/jira/browse/DERBY-280?page=comments#action_12357757 ]
Satheesh Bandaram commented on DERBY-280: ----------------------------------------- Thanks for updating the patch, Rick. But I think I found one issue, that definitely need fixing. I should have seen these at the first round itself... The fix can cause NullPointerExceptions. The following check is incorrect. + if ( + ( (newTableName == null) && (oldTableName == null) ) || + ( newTableName.equals( oldTableName ) ) + ) What happens if newTableName is NULL and oldTableName is NOT NULL? The code causes NullPointerException. ij> select bug280.a, a from bug280 group by a; ERROR XJ001: Java exception: ': java.lang.NullPointerException'. ij> > 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 > > -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira
