Horton

Re: Wrong rows estimations with joins of CTEs slows queries by more than factor 500

jian he <jian.universality@gmail.com>

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From: jian he <jian.universality@gmail.com>
To: Jian Guo <gjian@vmware.com>
Cc: Tomas Vondra <tomas.vondra@enterprisedb.com>, Hans Buschmann <buschmann@nidsa.net>, "pgsql-hackers@lists.postgresql.org" <pgsql-hackers@lists.postgresql.org>
Date: 2023-09-06T06:00:39Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Allow examine_simple_variable() to work on INSERT RETURNING Vars.

  2. Extract column statistics from CTE references, if possible.

  3. Remove SQL regression tests for GUCs related to NO_SHOW_ALL

Attachments

On Tue, Aug 22, 2023 at 10:35 AM Jian Guo <gjian@vmware.com> wrote:
>
> Sure, Tomas.
>
> Here is the PG Commitfest link: https://commitfest.postgresql.org/44/4510/
> ________________________________

hi.
wondering around http://cfbot.cputube.org/
there is a compiler warning: https://cirrus-ci.com/task/6052087599988736

I slightly edited the code, making the compiler warning out.

I am not sure if the following duplicate comment from (rte->rtekind ==
RTE_SUBQUERY && !rte->inh) branch is correct.
/*
* OK, recurse into the subquery.  Note that the original setting
* of vardata->isunique (which will surely be false) is left
* unchanged in this situation.  That's what we want, since even
* if the underlying column is unique, the subquery may have
* joined to other tables in a way that creates duplicates.
*/

Index varnoSaved = var->varno;
here varnoSaved should be int?

image attached is the coverage report
if I  understand coverage report correctly,
`
if (rel->subroot) examine_simple_variable(rel->subroot, var, vardata);
`
the above never actually executed?