On 4/10/07, Tom Lane <tgl@xxxxxxxxxxxxx> wrote:
"Merlin Moncure" <mmoncure@xxxxxxxxx> 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
