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Re: Do table-level CHECK constraints affect the query optimizer?

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Subject: Re: Do table-level CHECK constraints affect the query optimizer?
From: Mark Dilger <mark.dilger@xxxxxxxxxxxxxxxx>
Date: Tue, 29 Jun 2021 11:03:59 -0700
Cc: PostgreSQL General <pgsql-general@xxxxxxxxxxxxxxxxxxxx>
In-reply-to: <92045cad-cede-0e90-8d22-62c847f3104e@gmail.com>
References: <5f718120-a286-71ca-3d31-7bad70f0194e@gmail.com> <CAHOFxGpN2_Jfe9Ah1WqLgEGMtOkjqzDp+bb_SVm2O28rojZJQA@mail.gmail.com> <374d530d-ec98-f1ea-8d41-21e661aa9ab4@gmail.com> <449566.1624984976@sss.pgh.pa.us> <69232971-4992-6df9-d629-d45e8a176526@gmail.com> <452839.1624988762@sss.pgh.pa.us> <92045cad-cede-0e90-8d22-62c847f3104e@gmail.com>


> On Jun 29, 2021, at 11:02 AM, Ron <ronljohnsonjr@xxxxxxxxx> wrote:
> 
> What's an IOS?

An Index Only Scan.  See https://www.postgresql.org/docs/14/indexes-index-only-scans.html
—
Mark Dilger
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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References:
- Do table-level CHECK constraints affect the query optimizer?
  - From: Ron
- Re: Do table-level CHECK constraints affect the query optimizer?
  - From: Michael Lewis
- Re: Do table-level CHECK constraints affect the query optimizer?
  - From: Ron
- Re: Do table-level CHECK constraints affect the query optimizer?
  - From: Tom Lane
- Re: Do table-level CHECK constraints affect the query optimizer?
  - From: Ron
- Re: Do table-level CHECK constraints affect the query optimizer?
  - From: Tom Lane
- Re: Do table-level CHECK constraints affect the query optimizer?
  - From: Ron

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