On Mon, Nov 1, 2021 at 01:23:01PM +0000, PG Doc comments form wrote: > The following documentation comment has been logged on the website: > > Page: https://www.postgresql.org/docs/14/view-pg-stats-ext.html > Description: > > When table mytable is being inherited it may not contain any data but still > return row sets from the inheriting tables. Now doing CREATE STATISTICS on > mytable will work but won't have any values. > > This is very difficult to realize from a user's perspective and can be > either considered a feature or a bug, i.e. being enhanced. > > Given this is considered as a feature, I suggest to add a comment at the end > of this documentation > https://www.postgresql.org/docs/current/view-pg-stats-ext.html like this: > > << > Note then there are no values when the table is empty which happens when > there are tables which inherit from it. > << > > I could also think of a run-time warning?
I talked to Tomas Vondra and he says there will be proper parent statistics in PG 15, due to be released in the next 1-2 months. Here is the PG 15 release note item: https://www.postgresql.org/docs/15/release-15.html Allow extended statistics to record statistics for a parent with all its children (Tomas Vondra, Justin Pryzby) Regular statistics already tracked parent and parent/all-children statistics separately. -- Bruce Momjian <br...@momjian.us> https://momjian.us EDB https://enterprisedb.com Indecision is a decision. Inaction is an action. Mark Batterson