Re: PG 18 release notes draft committed

On Tue, May 6, 2025 at 03:08:13PM +0900, Amit Langote wrote:
> > I don't think most people would know what EquivalenceMember is, and even
> > if they did, would they be able to connect it to an SQL query?
>
> Thanks for splitting these (cf847d634). I think the text for the
> locking item should mention “during execution,” as David also
> suggested. Again, I don’t think this change belongs under Optimizer
> since it doesn’t really affect the planner -- it’s mainly an executor
> improvement. Maybe the General Performance section is a better fit.

Yes, good idea, done.

> Also, just to clarify why the individual items are meaningful
> performance improvements:
>
> * Locking change: Executing cached plans involving hundreds or
> thousands of partitions was bottlenecked by locking; with this change,
> execution is now roughly 20x faster with 1000 partitions.
>
> * Planning time improvements: Planning certain commonly used queries
> against partitioned tables when they don’t use partition pruning is
> now roughly 20x faster with 1000 partitions.

That's impressive!

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