Re: Is it useful to record whether plans are generic or custom?

From: legrand legrand <legrand_legrand(at)hotmail(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Is it useful to record whether plans are generic or custom?
Date: 2020-05-16 09:01:35
Message-ID: 1589619695044-0.post@n3.nabble.com
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-hackers

> To track executed plan types, I think execution layer hooks
> are appropriate.
> These hooks, however, take QueryDesc as a param and it does
> not include cached plan information.

It seems that the same QueryDesc entry is reused when executing
a generic plan.
For exemple marking queryDesc->plannedstmt->queryId (outside
pg_stat_statements) with a pseudo tag during ExecutorStart
reappears in later executions with generic plans ...

Is this QueryDesc reusable by a custom plan ? If not maybe a solution
could be to add a flag in queryDesc->plannedstmt ?

(sorry, I haven't understood yet how and when this generic plan is
managed during planning)

Regards
PAscal

--
Sent from: https://www.postgresql-archive.org/PostgreSQL-hackers-f1928748.html

In response to

Responses

Browse pgsql-hackers by date

  From Date Subject
Next Message Michael Paquier 2020-05-16 09:20:46 Re: Problem with logical replication
Previous Message Christopher Baines 2020-05-16 07:20:29 Re: [PATCH] Fix pg_dump --no-tablespaces for the custom format