Re: PostgreSQL 16 release announcement draft
jian he <jian.universality@gmail.com>
From: jian he <jian.universality@gmail.com>
To: "Jonathan S. Katz" <jkatz@postgresql.org>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>,
chelseadole@gmail.com
Date: 2023-08-23T10:20:49Z
Lists: pgsql-hackers
>>> 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 also <<<< "the query planner ....., and execute window functions more efficiently." since the query planner doesn't execute anything. probably "and optimize window functions execution"?
Commits
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Support "Right Anti Join" plan shapes.
- 16dc2703c541 16.0 cited
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Improve performance of ORDER BY / DISTINCT aggregates
- 1349d2790bf4 16.0 cited