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From: Michael Paquier <michael.paquier@gmail.com>
Date: Tue, 21 Jun 2016 09:21:59 +0900
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 <CAB7nPqSnP6GUYqsk1Qcw5un0dj+D3YwUooM5+m7OCk8MB5xXgw@mail.gmail.com>
Subject: Re: DROP EXTENSION
To: mschwan@opentext.com
Cc: pgsql-docs@postgresql.org
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On Tue, Jun 21, 2016 at 1:00 AM,  <mschwan@opentext.com> wrote:
> Page: https://www.postgresql.org/docs/9.5/static/sql-dropextension.html
> Description:
> I dropped an extension in my database with a function dependency.  The
> function was dropped (without messages of dependencies) and leaving the
> function intact.
> The lines &quot;DROP EXTENSION removes extensions from the database. Dropping an
> extension causes its component objects to be dropped as well.&quot; is not clear.
>  It should be stated that by default the dependencies remain intact after
> the drop.

I am not following here. If an extension is dropped, so are its
dependencies. See that for example:
=# create extension pg_trgm;
CREATE EXTENSION
Time: 27.978 ms
=# \dx+ pg_trgm
                                  Objects in extension "pg_trgm"
                                        Object Description
--------------------------------------------------------------------------------------------------
 function gin_extract_query_trgm(text,internal,smallint,internal,internal,internal,internal)
 function gin_extract_value_trgm(text,internal)
[... lots of objects, including functions ...]
=# DROP EXTENSION pg_trgm;
DROP EXTENSION
=# \df gin_extract_query_trgm
                       List of functions
 Schema | Name | Result data type | Argument data types | Type
--------+------+------------------+---------------------+------
(0 rows)
-- 
Michael


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