Re: Possible regression in PG18 beta1

From: Sami Imseih <samimseih(at)gmail(dot)com>
To: Sadeq Dousti <msdousti(at)gmail(dot)com>
Cc: Christophe Courtois <christophe(dot)courtois(at)dalibo(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: Possible regression in PG18 beta1
Date: 2025-05-17 17:29:57
Message-ID: CAA5RZ0trV3Y93U3usD6EmpfViHR=+7exFEhutJO3ExWtu9L0ew@mail.gmail.com
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>> > * Also, I noticed "explain analyze" reports actual rows as a decimal
>> > number (1.00) as opposed to an integer (1); not sure if that's intentional.

Yes, this is intentional as of 95dbd827f2edc

>> > * Changing the table from TEMP to UNLOGGED makes both versions use
>> > "Parallel Seq Scan", with PG18 being ~25% faster. (190ms vs. 150ms).

I'll be curious about tests with a normal table as well with a
sufficiently large
shared_buffers.

--
Sami Imseih
Amazon Web Services (AWS)

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