RE: Allow logical replication to copy tables in binary format - Mailing list pgsql-hackers

From Takamichi Osumi (Fujitsu)
Subject RE: Allow logical replication to copy tables in binary format
Date
Msg-id TYCPR01MB83731E3ACC68CCEBD2E48541EDFD9@TYCPR01MB8373.jpnprd01.prod.outlook.com
Whole thread Raw
In response to Re: Allow logical replication to copy tables in binary format  (Melih Mutlu <m.melihmutlu@gmail.com>)
Responses Re: Allow logical replication to copy tables in binary format
List pgsql-hackers
On Wednesday, January 11, 2023 7:45 PM Melih Mutlu <m.melihmutlu@gmail.com> wrote:
> Thanks for your review.
> Done.
Hi, minor comments on v5.


(1) publisher's version check

+       /* If the publisher is v16 or later, copy in binary format.*/
+       server_version = walrcv_server_version(LogRepWorkerWalRcvConn);
+       if (server_version >=160000 && MySubscription->binary)
+       {
+               appendStringInfoString(&cmd, "  WITH (FORMAT binary)");
+               options = lappend(options, makeDefElem("format", (Node *) makeString("binary"), -1));
+       }
+
+       elog(LOG, "version: %i, %s", server_version, cmd.data);

(1-1) There is no need to log the version and the query by elog here.
(1-2) Also, I suggest we can remove the server_version variable itself,
      because we have only one actual reference for it.
      There is a style that we call walrcv_server_version in the
      'if condition' directly like existing codes in fetch_remote_table_info().
(1-3) Suggestion to improve comments.
      FROM:
      /* If the publisher is v16 or later, copy in binary format.*/
      TO:
      /* If the publisher is v16 or later, copy data in the required data format. */


(2) Minor suggestion for some test code alignment.

 $result =
   $node_subscriber->safe_psql('postgres',
        "SELECT sum(a) FROM tst_dom_constr");
-is($result, '21', 'sql-function constraint on domain');
+is($result, '33', 'sql-function constraint on domain');
+
+$result_binary =
+  $node_subscriber->safe_psql('postgres',
+       "SELECT sum(a) FROM tst_dom_constr");
+is($result_binary, '33', 'sql-function constraint on domain');


I think if we change the order of this part of check like below, then
it would look more aligned with other existing test codes introduced by this patch.

---
my $domain_check = 'SELECT sum(a) FROM tst_dom_constr';
$result = $node_subscriber->safe_psql('postgres', $domain_check);
$result_binary = $node_subscriber->safe_psql('postgres', $domain_check);
is($result, '33', 'sql-function constraint on domain');
is($result_binary, '33', 'sql-function constraint on domain in binary');
---



Best Regards,
    Takamichi Osumi




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