Tom Lane wrote:
> Ron Mayer <rm_pg@cheapcomplexdevices.com> writes:
>> ...bitmap cost estimates didn't also change much....
>
> By definition, a bitmap scan's cost isn't affected by index order
> correlation.
No? I think I understand that for index scans the correlation
influenced how many data pages are estimated to get sucked in.
Wouldn't a bitmap scan using a single index also fetch roughly
the same number of data pages as an index scan?
I'm not complaining, since 8.3's doing great on all my real-world
queries. And sorry for my naive questions - feel free to tell
me to just read the code if this is something I should be able
to figure out myself.
