On Wed, 23 Aug 2023 at 22:21, jian he <jian.universality@gmail.com> wrote:
>
> >>>
> PostgreSQL 16 improves the performance of existing PostgreSQL functionality
> through new query planner optimizations. In this latest release, the query
> planner can parallelize `FULL` and `RIGHT` joins, utilize incremental sorts for
> `SELECT DISTINCT` queries, and execute window functions more efficiently. It
> also introduces `RIGHT` and `OUTER` "anti-joins", which enable users to identify
> rows not present in a joined table.
> >>>
>
> I think "utilize incremental sorts is for" something like select
> my_avg(distinct one),my_sum(one) from (values(1),(3)) t(one);
> so it's not the same as `SELECT DISTINCT` queries?
> ref: https://git.postgresql.org/cgit/postgresql.git/commit/?id=1349d2790bf48a4de072931c722f39337e72055e
The incremental sorts for DISTINCT will likely be a reference to
3c6fc5820, so, not the same thing as 1349d2790. I don't see anything
there relating to 1349d2790.
> also
> <<<< "the query planner ....., and execute window functions more efficiently."
> since the query planner doesn't execute anything. probably "and
> optimize window functions execution"?
Yeah, that or "and optimize window functions so they execute more
efficiently" is likely an improvement there.
David
