"Ingram, Bryan" <BIngram@sixtyfootspider.com> writes:
>> Also it would be useful to see the full declarations of the tables
>> and their indexes; I'm wondering what datatype the zip columns are,
>> for example.
> Table = atms
> | zip | text |
> Table = zips
> | zip | varchar() |
Ah, there's your problem --- the planner is not very smart about
optimizing cross-datatype comparisons. Make these columns both text,
or both varchar, and I'll bet you get a more intelligent plan.
Current sources (7.1-to-be) are a little smarter than 7.0 about
cross-data-type joins, but they still don't get this case right.
I have a TODO item about that, but I dunno if it'll get done before
7.1 ...
regards, tom lane