I wrote:
> Dennis Bjorklund <db@zigo.dhs.org> writes:
>> This testcase works in 7.3 but not in 7.4:
>> create table t1 (a int);
>> create table t2 (b int);
>> select * from t1, (select b as a from t2 group by a) as foo;
> Another tweak we could make is to cause findTargetlistEntry() to look
> only for local variable names before looking for targetlist alias
> matches. This would effectively change the precedence for resolving
> "GROUP BY x" to be (1) x as a local variable, (2) x as a targetlist
> alias, (3) x as an outer variable; whereas the present search order is
> (1), (3), (2). AFAICS this does not break compatibility with either
> SQL92 or SQL99 because both of them allow only case (1).
I've patched both 7.4 and HEAD branches to do things this way.
regards, tom lane
