Improve documentation for current_setting function

From: PG Doc comments form <noreply(at)postgresql(dot)org>
To: pgsql-docs(at)lists(dot)postgresql(dot)org
Cc: kes-kes(at)yandex(dot)ru
Subject: Improve documentation for current_setting function
Date: 2019-02-20 12:59:45
Message-ID: 155066758528.1380.15762542539181651429@wrigleys.postgresql.org
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The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/11/functions-admin.html
Description:

Hi.

Doc is not clear about what is returned if current_setting(
'app.not_existent', true ) is called.

Does it return empty string '', because return type is 'text' or it return
NULL, because 'app.not_existent' does not exist

Thank you.

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