> On Thu, Dec 20, 2018 at 2:46 PM Dmitry Dolgov <9erthalion6@gmail.com> wrote:
>
> I've performed some testing, and on my environment with a dataset of 10^7
> records:
>
> * everything below 7.5 * 10^5 unique records out of 10^7 was faster with skip
> scan.
>
> * above 7.5 * 10^5 unique records skip scan was slower, e.g. for 10^6 unique
> records it was about 20% slower than the regular index scan.
>
> For me these numbers sound good, since even in quite extreme case of
> approximately 10 records per group the performance of index skip scan is close
> to the same for the regular index only scan.
Rebased version after rd_amroutine was renamed.