On Fri, Nov 01, 2019 at 11:11:13AM -0300, Igor Calabria wrote:
>Yeah, I agree that there's no reason to store the digests themselves and I
>really liked the idea of it being optional.
That's not what I wrote. My point was that we *should* store the digests
themselves, otherwise we just introduce additional errors into the
estimates, because it discards the weights/frequencies.
>If it turns out that memory consumption on real workloads is small enough,
>it could eventually be turned on by default.
>
Maybe, but it's not just about memory consumption. CPU matters too.
regards
--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
