From: Tom Lane <tgl@sss.pgh.pa.us>
To: Álvaro Herrera <alvherre@kurilemu.de>
Cc: Kirill Reshke <reshkekirill@gmail.com>
Cc: jian he <jian.universality@gmail.com>
Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>
Subject: Re: misleading error message in ProcessUtilitySlow T_CreateStatsStmt
Date: Fri, 22 Aug 2025 11:50:52 -0400
Message-ID: <1885537.1755877852@sss.pgh.pa.us> (raw)
In-Reply-To: <202508221535.gixsh3lgyy2z@alvherre.pgsql>
References: <202508221535.gixsh3lgyy2z@alvherre.pgsql>
=?utf-8?Q?=C3=81lvaro?= Herrera <alvherre@kurilemu.de> writes:
> Yeah, AFAIR I wrote it (or at least heavily edited the original to get
> to that), and I was trying to convey exactly those two ideas. If you
> want to propose improvements, they're very welcome.
Hmmm ... maybe something like
Mathematically, a "relation" is a set of tuples; this is the sense
meant in the term "relational database".
In Postgres, "relation" is commonly used to mean a database object
that has a name and a list of attributes defined in a specific
order. Tables, sequences, views, foreign tables, materialized
views, composite types, and indexes are all relations. A relation
in this sense is a container or descriptor for a set of tuples.
"Class" is an alternative but archaic term. The system catalog
pg_class holds an entry for each Postgres relation.
regards, tom lane
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To: pgsql-hackers@postgresql.org
Cc: tgl@sss.pgh.pa.us, alvherre@kurilemu.de, reshkekirill@gmail.com, jian.universality@gmail.com
Subject: Re: misleading error message in ProcessUtilitySlow T_CreateStatsStmt
In-Reply-To: <1885537.1755877852@sss.pgh.pa.us>
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