From: Tom Lane <tgl@sss.pgh.pa.us>
To: Sumeet Shukla <sumeet.k.shukla@gmail.com>
cc: pgsql-admin <pgsql-admin@postgresql.org>
Subject: Re: Find if a function is being referenced in another function in the
 database
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Comments: In-reply-to Sumeet Shukla <sumeet.k.shukla@gmail.com>
 message dated "Wed, 02 Dec 2015 13:32:05 +0530"
Date: Wed, 02 Dec 2015 10:05:40 -0500
Message-ID: <15737.1449068740@sss.pgh.pa.us>
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Sender: pgsql-admin-owner@postgresql.org

Sumeet Shukla <sumeet.k.shukla@gmail.com> writes:
> Can someone guide me on how can I find if a given function is being
> referenced by other functions in the same database. If being referenced
> then a list of functions that are referencing it?

Postgres does not track this in any way, because function bodies are for
the most part just black boxes to the core database.

As a first approximation, you could grep (LIKE/regexp search) the
pg_proc.prosrc column for the names of functions you're interested in.
This would have some problems with overloaded functions, and it's
certainly possible to hide calls from it if you want to, but it's a start.
Something like

select s.proname as caller, t.proname as callee
from pg_proc t, pg_proc s
where s.prosrc ~ ('\W' || t.proname || '\(')
  and s.prolang > 13 and t.prolang > 13;

(The prolang conditions exclude C/internal functions; this query will
run quite a long time if you include those.)

			regards, tom lane


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