| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Andrei Zubkov <zubkov(at)moonset(dot)ru> |
| Cc: | Michael Paquier <michael(at)paquier(dot)xyz>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: [PATCH] pg_statio_all_tables: several rows per table due to invalid TOAST index |
| Date: | 2022-03-20 22:33:54 |
| Message-ID: | 1742254.1647815634@sss.pgh.pa.us |
| Views: | Whole Thread | Raw Message | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
I wrote:
> ... We need to sum separately over the
> table indexes and toast indexes, and I don't immediately see how
> to do that without creating an optimization fence.
After a bit of further fooling, I found that we could make that
work with LEFT JOIN LATERAL. This formulation has a different
problem, which is that if you do want most or all of the output,
computing each sub-aggregation separately is probably less
efficient than it could be. But this is probably the better way
to go unless someone has an even better idea.
regards, tom lane
| Attachment | Content-Type | Size |
|---|---|---|
| v3-0001-pg_statio_all_tables-several-rows-per-table.patch | text/x-diff | 4.8 KB |
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Tomas Vondra | 2022-03-20 22:55:37 | Re: logical decoding and replication of sequences |
| Previous Message | Tom Lane | 2022-03-20 22:08:34 | Re: [PATCH] pg_statio_all_tables: several rows per table due to invalid TOAST index |