Re: PoC/WIP: Extended statistics on expressions - Mailing list pgsql-hackers

From Justin Pryzby
Subject Re: PoC/WIP: Extended statistics on expressions
Date
Msg-id 20210122040101.GF27167@telsasoft.com
Whole thread Raw
In response to Re: PoC/WIP: Extended statistics on expressions  (Tomas Vondra <tomas.vondra@enterprisedb.com>)
Responses Re: PoC/WIP: Extended statistics on expressions  (Justin Pryzby <pryzby@telsasoft.com>)
Re: PoC/WIP: Extended statistics on expressions  (Tomas Vondra <tomas.vondra@enterprisedb.com>)
List pgsql-hackers
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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