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From: Jeff Davis <[email protected]>
To: Andrew Dunstan <[email protected]>
To: David G. Johnston <[email protected]>
To: Japin Li <[email protected]>
Cc: Zsolt Parragi <[email protected]>
Cc: Euler Taveira <[email protected]>
Cc: Álvaro Herrera <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: pg_get__*_ddl consolidation
Date: Fri, 10 Apr 2026 13:03:36 -0700
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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On Sun, 2026-04-05 at 11:06 -0400, Andrew Dunstan wrote:
> Pushed. I have moved the remaining get_*_ddl items to PG20-1

The line:

  role_settings = DatumGetArrayTypeP(datum);

should be DatumGetArrayTypePCopy(), because it's being pfree()d later.
The existing code will sometimes make a copy and sometimes not, e.g.:

  -- settings are contrived to make the datum inline
  CREATE USER u1;
  ALTER ROLE u1 SET search_path = 'public, pg_catalog, pg_temp';
  ALTER ROLE u1 SET work_mem='64MB';
  ALTER ROLE u1 SET statement_timeout='30s';
  ALTER ROLE u1 SET lock_timeout='10s';
  ALTER ROLE u1 SET idle_in_transaction_session_timeout = '60s';
  SELECT pg_get_role_ddl('u1');
  ERROR:  pfree called with invalid pointer 0x7986dd0c7cc8 (header
0x0000400600000000)

Also, it looks like the scan key in pg_get_role_ddl_internal() uses
only the second attribute of the index, which might be worth a comment.

Regards,
	Jeff Davis

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