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help / color / mirror / Atom feedFrom: Tom Lane <tgl@sss.pgh.pa.us>
To: Voillequin, Jean-Marc <Jean-Marc.Voillequin@moodys.com>
Cc: pgsql-sql@lists.postgresql.org <pgsql-sql@lists.postgresql.org>
Subject: Re: parallel safe on user defined functions
Date: Wed, 02 Dec 2020 11:15:35 -0500
Message-ID: <1574257.1606925735@sss.pgh.pa.us> (raw)
In-Reply-To: <DM6PR20MB3329006C838039F0B3F43E64BEF30@DM6PR20MB3329.namprd20.prod.outlook.com>
References: <DM6PR20MB3329006C838039F0B3F43E64BEF30@DM6PR20MB3329.namprd20.prod.outlook.com>
"Voillequin, Jean-Marc" <Jean-Marc.Voillequin@moodys.com> writes:
> For instance, is the following plpython3u function parallel safe?
> create or replace function f1(key text, val_default in text default null) returns text as $$
> return GD.get(key.lower(),val_default)
> $$ language plpython3u;
No. There's no mechanism for sharing Python interpreter state across
processes.
> => Is it a transaction state change?
Throwing an error is always OK (we could hardly decree otherwise).
> execute format('select (''%s''::date + interval ''%s'')::date',d,concat(n,' day')) into ret;
> => Is this execute statement be considered as a cursor?
No, it's just a weird way of spelling a variable assignment.
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, Jean-Marc.Voillequin@moodys.com, pgsql-sql@lists.postgresql.org
Subject: Re: parallel safe on user defined functions
In-Reply-To: <1574257.1606925735@sss.pgh.pa.us>
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