From: Tom Lane <tgl@sss.pgh.pa.us>
To: JED WALKER <jedwa@comcast.net>
Cc: pgsql-bugs@lists.postgresql.org <pgsql-bugs@lists.postgresql.org>
Cc: Jed@ICD <jed.walker@icd-tech.com>
Subject: Re: v12.4 pg_dump .sql fails to load data via psql
Date: Mon, 11 Oct 2021 18:55:25 -0400
Message-ID: <526204.1633992925@sss.pgh.pa.us> (raw)
In-Reply-To: <375102856.69594.1633991178400@connect.xfinity.com>
References: <375102856.69594.1633991178400@connect.xfinity.com>
JED WALKER <jedwa@comcast.net> writes:
> PostgreSQL v12.4 pg_dumpall output fails to load via "psql -f" load to empty instance/server.
> This occurs using check constraints that reference a function using data in a table that is loaded later.
That's never worked reliably, neither in v12 nor any other version.
The function is a "black box", so the fact that it creates an ordering
constraint isn't apparent to pg_dump.
Note that our documentation specifically disclaims correct enforcement
of CHECK constraints that reference any mutable data other than the row
being checked (see NOTEs at [1]). Even if the particular scenario you
describe here happened to work, there are many other cases where such a
constraint could become violated after it was initially checked --- and
Postgres wouldn't notice. Nor do we have any interest in making it
notice.
regards, tom lane
[1] https://www.postgresql.org/docs/current/ddl-constraints.html#DDL-CONSTRAINTS-CHECK-CONSTRAINTS
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To: pgsql-bugs@postgresql.org
Cc: tgl@sss.pgh.pa.us, jedwa@comcast.net, pgsql-bugs@lists.postgresql.org, jed.walker@icd-tech.com
Subject: Re: v12.4 pg_dump .sql fails to load data via psql
In-Reply-To: <526204.1633992925@sss.pgh.pa.us>
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