Re: extended statistics n-distinct on multiple columns not used when join two tables

(moving to -hackers)

On Tue, 13 Jun 2023 at 21:30, Pavel Stehule <pavel.stehule@gmail.com> wrote:
> út 13. 6. 2023 v 11:21 odesílatel James Pang (chaolpan) <chaolpan@cisco.com> napsal:
>>      When join two table on multiple columns equaljoin, rows estimation always use selectivity = multiplied by
distinctmultiple individual columns, possible to use  extended n-distinct statistics on multiple columns? 
>>
>>     PG v14.8-1, attached please check test case with details.
>
> There is not any support for multi tables statistic

I think it's probably worth adjusting the docs to mention this. It
seems like it might be something that could surprise someone.

Something like the attached, maybe?

David