Re: EXPLAIN (ANALYZE, BUFFERS) - puzzling numbers for a simple query.

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>
Cc: David Rowley <dgrowleyml(at)gmail(dot)com>, Pól Ua Laoínecháin <linehanp(at)tcd(dot)ie>, PostgreSQL General <pgsql-general(at)lists(dot)postgresql(dot)org>
Subject: Re: EXPLAIN (ANALYZE, BUFFERS) - puzzling numbers for a simple query.
Date: 2021-06-04 13:43:03
Message-ID: 143204.1622814183@sss.pgh.pa.us
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Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at> writes:
> On Sat, 2021-06-05 at 00:12 +1200, David Rowley wrote:
>> As for the call to generate_series, you're not likely to ever get any
>> great estimation from that.

> "generate_series" has a support function from v12 on:

True, but I don't think it can do anything with non-constant inputs,
as we have in the OP's case.

regards, tom lane

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