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From: Justin Pryzby <pryzby@telsasoft.com>
To: Tomas Vondra <tomas.vondra@enterprisedb.com>
Cc: Dean Rasheed <dean.a.rasheed@gmail.com>
Cc: pgsql-hackers@postgresql.org
Subject: Re: PoC/WIP: Extended statistics on expressions
Date: Thu, 21 Jan 2021 22:01:01 -0600
Message-ID: <20210122040101.GF27167@telsasoft.com> (raw)
In-Reply-To: <acf27932-8159-8872-8fca-902c7a35b351@enterprisedb.com>
References: <5305f9cf-3927-06c4-cd5b-e46cbc58bc7f@enterprisedb.com>
	<20210116232208.GB8560@telsasoft.com>
	<2f2a3b3b-93e4-723f-144e-bc21f10d6b61@enterprisedb.com>
	<20210118045331.GF8560@telsasoft.com>
	<CAEZATCVnQccV_Z7AuvbvquaOYxUj+cVFk48pPGASYHFjXWgW5g@mail.gmail.com>
	<3f20da4d-89dc-0912-98d2-b6f0ef06c87f@enterprisedb.com>
	<CAEZATCUuj5FPjtOU2=7Z2pTC8LEvrf79+Go7R8yQ+eE0ezfgfQ@mail.gmail.com>
	<f865af90-c19c-769e-8c65-19692e245479@enterprisedb.com>
	<20210122022958.GC27167@telsasoft.com>
	<acf27932-8159-8872-8fca-902c7a35b351@enterprisedb.com>

On Fri, Jan 22, 2021 at 04:49:51AM +0100, Tomas Vondra wrote:
> > > | Statistics objects:
> > > |     "public"."s2" (ndistinct, dependencies, mcv) ON  FROM t
> 
> Umm, for me that prints:

>     "public"."s2" ON ((i + 1)), (((i + 1) + 0)) FROM t
> 
> which I think is OK. But maybe there's something else to trigger the
> problem?

Oh.  It's because I was using /usr/bin/psql and not ./src/bin/psql.
I think it's considered ok if old client's \d commands don't work on new
server, but it's not clear to me if it's ok if they misbehave.  It's almost
better it made an ERROR.

In any case, why are there so many parentheses ?

-- 
Justin





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