> On Thu, Dec 20, 2018 at 2:46 PM Dmitry Dolgov <9erthali...@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.
0001-Index-skip-scan-v6.patch
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