proposal: plpgsql pragma statement

From: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
To: PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: proposal: plpgsql pragma statement
Date: 2018-12-04 17:12:46
Message-ID: CAFj8pRALJQnTbvc-Vt-5Lni8C8CtRS0S249hqN9=so+6bmhyqQ@mail.gmail.com
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Hi

I wrote plpgsql_check https://github.com/okbob/plpgsql_check.

It is working well, but because it does static analyse only, sometimes it
can produces false alarms or it should to stop a analyse, because there are
not necessary data.

https://github.com/okbob/plpgsql_check/issues/36

I see one possible solution in introduction of pragma statement with syntax:

PRAGMA keyword [content to semicolon];

The pragma has a relation to following statement. So the issue 36 can be
solved by pragma

PRAGMA cmdtype CREATE;
EXECUTE format('CREATE TABLE xxx ...

The PRAGMA statement does nothing in runtime. It works only in compile
time, and add a pair of key, value to next non pragma statement. This
information can be used by some plpgsql extensions.

What do you think about this proposal?

Regards

Pavel

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