From 33acd81f90ccd1ebdd75fbdf58024edb8f10f6a1 Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Mon, 13 Mar 2023 19:01:42 -0400
Subject: [PATCH v2 1/6] Create a test case for dump-and-restore of hashed-enum
 partitioning.

I'm not sure we want to commit this, at least not in this form,
but it's able to demonstrate both the deadlock problem (when using
--load-via-partition-root) and the change-of-hash-code problem
(when not).
---
 src/bin/pg_dump/meson.build               |  1 +
 src/bin/pg_dump/t/004_pg_dump_parallel.pl | 66 +++++++++++++++++++++++
 2 files changed, 67 insertions(+)
 create mode 100644 src/bin/pg_dump/t/004_pg_dump_parallel.pl

diff --git a/src/bin/pg_dump/meson.build b/src/bin/pg_dump/meson.build
index ab4c25c781..b2fb7ac77f 100644
--- a/src/bin/pg_dump/meson.build
+++ b/src/bin/pg_dump/meson.build
@@ -96,6 +96,7 @@ tests += {
       't/001_basic.pl',
       't/002_pg_dump.pl',
       't/003_pg_dump_with_server.pl',
+      't/004_pg_dump_parallel.pl',
       't/010_dump_connstr.pl',
     ],
   },
diff --git a/src/bin/pg_dump/t/004_pg_dump_parallel.pl b/src/bin/pg_dump/t/004_pg_dump_parallel.pl
new file mode 100644
index 0000000000..c3f7d20b13
--- /dev/null
+++ b/src/bin/pg_dump/t/004_pg_dump_parallel.pl
@@ -0,0 +1,66 @@
+
+# Copyright (c) 2021-2023, PostgreSQL Global Development Group
+
+use strict;
+use warnings;
+
+use PostgreSQL::Test::Cluster;
+use PostgreSQL::Test::Utils;
+use Test::More;
+
+my $dbname1 = 'regression_src';
+my $dbname2 = 'regression_dest1';
+my $dbname3 = 'regression_dest2';
+
+my $node = PostgreSQL::Test::Cluster->new('main');
+$node->init;
+$node->start;
+
+my $backupdir = $node->backup_dir;
+
+$node->run_log([ 'createdb', $dbname1 ]);
+$node->run_log([ 'createdb', $dbname2 ]);
+$node->run_log([ 'createdb', $dbname3 ]);
+
+$node->safe_psql(
+	$dbname1,
+	qq{
+create type digit as enum ('0', '1', '2', '3', '4', '5', '6', '7', '8', '9');
+create table t0 (en digit, data int) partition by hash(en);
+create table t0_p1 partition of t0 for values with (modulus 3, remainder 0);
+create table t0_p2 partition of t0 for values with (modulus 3, remainder 1);
+create table t0_p3 partition of t0 for values with (modulus 3, remainder 2);
+insert into t0 select (x%10)::text::digit, x from generate_series(1,1000) x;
+	});
+
+$node->command_ok(
+	[
+		'pg_dump', '-Fd', '--no-sync', '-j2', '-f', "$backupdir/dump1",
+		$node->connstr($dbname1)
+	],
+	'parallel dump');
+
+$node->command_ok(
+	[
+		'pg_restore', '-v',
+		'-d',         $node->connstr($dbname2),
+		'-j3',        "$backupdir/dump1"
+	],
+	'parallel restore');
+
+$node->command_ok(
+	[
+		'pg_dump', '-Fd', '--no-sync', '-j2', '-f', "$backupdir/dump2",
+		'--load-via-partition-root', $node->connstr($dbname1)
+	],
+	'parallel dump via partition root');
+
+$node->command_ok(
+	[
+		'pg_restore', '-v',
+		'-d',         $node->connstr($dbname3),
+		'-j3',        "$backupdir/dump2"
+	],
+	'parallel restore via partition root');
+
+done_testing();
-- 
2.31.1