On 4/10/07, Tom Lane <[EMAIL PROTECTED]> wrote:
"Merlin Moncure" <[EMAIL PROTECTED]> writes:
> For some reason, I can't get the index to be used on the table sitting
> under a view during a join, even though it should be, or at least it
> seems....
Nope, that's not going to work, because the aggregate keeps the subquery
from being flattened into the upper query, which is what would have to
happen for a nestloop-with-inner-indexscan join to be considered.
AFAICS you've got to structure it so that the aggregation happens above
the join.
right, i see that it's actually the 'group by' that does it:
select a, b from foo join (select a, b from bar group by a,b) q using (a,b);
is enough to keep it from using the index on a,b from bar. thats too bad...
merlin
---------------------------(end of broadcast)---------------------------
TIP 4: Have you searched our list archives?
http://archives.postgresql.org
