RE: [PATHC] Fix minor memory leak in pg_basebackup

Hi  Michael

so much the better!

-----Original Message-----
From: Michael Paquier [mailto:michael@paquier.xyz] 
Sent: Thursday, April 16, 2020 2:31 PM
To: Zhang, Jie/张 杰 <zhangjie2@cn.fujitsu.com>
Cc: pgsql-hackers@lists.postgresql.org
Subject: Re: [PATHC] Fix minor memory leak in pg_basebackup

On Wed, Apr 15, 2020 at 10:06:52AM +0000, Zhang, Jie wrote:
> In some cases , PGresult is not cleared.
> 
> File: src\bin\pg_basebackup\streamutil.c
> 
> bool
> RetrieveWalSegSize(PGconn *conn)
> {
> 	PGresult   *res;

RetrieveWalSegSize() gets called only once at the beginning of pg_basebackup and pg_receivewal, so that's not an issue that has major effects, still that's an issue.  The first one PQclear() is needed where you say.  Now for the second one, I would just move it once the code is done with the query result, aka after calling PQgetvalue().
What do you think?  Please see the attached.
--
Michael