I wrote:
> OK, I'll take a look at that and make a new draft.

Here's version 2, incorporating your suggestions and with some
further work to make it handle 9.2 fully.  I think this could
be committable so far as HEAD is concerned, though I still
need to make versions of AdjustUpgrade.pm for the back branches.

I tried to use this to replace upgrade_adapt.sql, but failed so
far because I couldn't figure out exactly how you're supposed
to use 002_pg_upgrade.pl with an old source installation.
It's not terribly well documented.  In any case I think we
need a bit more thought about that, because it looks like
002_pg_upgrade.pl thinks that you can supply any random dump
file to serve as the initial state of the old installation;
but neither what I have here nor any likely contents of
upgrade_adapt.sql or the "custom filter" rules are going to
work on databases that aren't just the standard regression
database(s) of the old version.

I assume we should plan on reverting 9814ff550 (Add custom filtering
rules to the TAP tests of pg_upgrade)?  Does that have any
plausible use that's not superseded by this patchset?

                        regards, tom lane

diff --git a/src/test/perl/PostgreSQL/Test/AdjustUpgrade.pm b/src/test/perl/PostgreSQL/Test/AdjustUpgrade.pm
new file mode 100644
index 0000000000..622f649b05
--- /dev/null
+++ b/src/test/perl/PostgreSQL/Test/AdjustUpgrade.pm
@@ -0,0 +1,500 @@
+
+# Copyright (c) 2023, PostgreSQL Global Development Group
+
+=pod
+
+=head1 NAME
+
+PostgreSQL::Test::AdjustUpgrade - helper module for cross-version upgrade tests
+
+=head1 SYNOPSIS
+
+  use PostgreSQL::Test::AdjustUpgrade;
+
+  # Build commands to adjust contents of old-version database before dumping
+  $statements = adjust_database_contents($old_version, %dbnames);
+
+  # Adjust contents of old pg_dumpall output file to match newer version
+  $dump = adjust_old_dumpfile($old_version, $dump);
+
+  # Adjust contents of new pg_dumpall output file to match older version
+  $dump = adjust_new_dumpfile($old_version, $dump);
+
+=head1 DESCRIPTION
+
+C<PostgreSQL::Test::AdjustUpgrade> encapsulates various hacks needed to
+compare the results of cross-version upgrade tests.
+
+=cut
+
+package PostgreSQL::Test::AdjustUpgrade;
+
+use strict;
+use warnings;
+
+use Exporter 'import';
+use PostgreSQL::Version;
+
+our @EXPORT = qw(
+  adjust_database_contents
+  adjust_old_dumpfile
+  adjust_new_dumpfile
+);
+
+=pod
+
+=head1 ROUTINES
+
+=over
+
+=item $statements = adjust_database_contents($old_version, %dbnames)
+
+Generate SQL commands to perform any changes to an old-version installation
+that are needed before we can pg_upgrade it into the current PostgreSQL
+version.
+
+Typically this involves dropping or adjusting no-longer-supported objects.
+
+Arguments:
+
+=over
+
+=item C<old_version>: Branch we are upgrading from.  This can be a branch
+name such as 'HEAD' or 'REL_11_STABLE', but it can also be any string
+that PostgreSQL::Version accepts.
+
+=item C<dbnames>: Hash of database names present in the old installation.
+
+=back
+
+Returns a reference to a hash, wherein the keys are database names and the
+values are arrayrefs to lists of statements to be run in those databases.
+
+=cut
+
+sub adjust_database_contents
+{
+	my ($old_version, %dbnames) = @_;
+	my $result = {};
+
+	# nothing to do for non-cross-version tests
+	return $result if $old_version eq 'HEAD';
+
+	# convert branch name to numeric form
+	$old_version =~ s/REL_?(\d+(?:_\d+)?)_STABLE/$1/;
+	$old_version =~ s/_/./;
+	$old_version = PostgreSQL::Version->new($old_version);
+
+	# remove dbs of modules known to cause pg_upgrade to fail
+	# anything not builtin and incompatible should clean up its own db
+	foreach my $bad_module ('test_ddl_deparse', 'tsearch2')
+	{
+		if ($dbnames{"contrib_regression_$bad_module"})
+		{
+			_add_st($result, 'postgres',
+				"drop database contrib_regression_$bad_module");
+			delete($dbnames{"contrib_regression_$bad_module"});
+		}
+	}
+
+	# avoid version number issues with test_ext7
+	if ($dbnames{contrib_regression_test_extensions})
+	{
+		_add_st(
+			$result,
+			'contrib_regression_test_extensions',
+			'drop extension if exists test_ext7');
+	}
+
+	# stuff not supported from release 16
+	if ($old_version >= 12 && $old_version < 16)
+	{
+		# Can't upgrade aclitem in user tables from pre 16 to 16+.
+		_add_st($result, 'regression',
+			'alter table public.tab_core_types drop column aclitem');
+		# Can't handle child tables with locally-generated columns.
+		_add_st(
+			$result, 'regression',
+			'drop table public.gtest_normal_child',
+			'drop table public.gtest_normal_child2');
+	}
+
+	# stuff not supported from release 14
+	if ($old_version < 14)
+	{
+		# postfix operators (some don't exist in very old versions)
+		_add_st(
+			$result,
+			'regression',
+			'drop operator #@# (bigint,NONE)',
+			'drop operator #%# (bigint,NONE)',
+			'drop operator if exists !=- (bigint,NONE)',
+			'drop operator if exists #@%# (bigint,NONE)');
+
+		# get rid of dblink's dependencies on regress.so
+		my $regrdb =
+		  $old_version le '9.4'
+		  ? 'contrib_regression'
+		  : 'contrib_regression_dblink';
+
+		if ($dbnames{$regrdb})
+		{
+			_add_st(
+				$result, $regrdb,
+				'drop function if exists public.putenv(text)',
+				'drop function if exists public.wait_pid(integer)');
+		}
+	}
+
+	# user table OIDs are gone from release 12 on
+	if ($old_version < 12)
+	{
+		my $nooid_stmt = q{
+           DO $stmt$
+           DECLARE
+              rec text;
+           BEGIN
+              FOR rec in
+                 select oid::regclass::text
+                 from pg_class
+                 where relname !~ '^pg_'
+                    and relhasoids
+                    and relkind in ('r','m')
+                 order by 1
+              LOOP
+                 execute 'ALTER TABLE ' || rec || ' SET WITHOUT OIDS';
+                 RAISE NOTICE 'removing oids from table %', rec;
+              END LOOP;
+           END; $stmt$;
+        };
+
+		foreach my $oiddb ('regression', 'contrib_regression_btree_gist')
+		{
+			next unless $dbnames{$oiddb};
+			_add_st($result, $oiddb, $nooid_stmt);
+		}
+
+		# this table had OIDs too, but we'll just drop it
+		if ($old_version >= 10 && $dbnames{'contrib_regression_postgres_fdw'})
+		{
+			_add_st(
+				$result,
+				'contrib_regression_postgres_fdw',
+				'drop foreign table ft_pg_type');
+		}
+	}
+
+	# abstime+friends are gone from release 12 on; but these tables
+	# might or might not be present depending on regression test vintage
+	if ($old_version < 12)
+	{
+		_add_st($result, 'regression',
+			'drop table if exists abstime_tbl, reltime_tbl, tinterval_tbl');
+	}
+
+	# some regression functions gone from release 11 on
+	if ($old_version < 11)
+	{
+		_add_st(
+			$result, 'regression',
+			'drop function if exists public.boxarea(box)',
+			'drop function if exists public.funny_dup17()');
+	}
+
+	# version-0 C functions are no longer supported
+	if ($old_version < 10)
+	{
+		_add_st($result, 'regression',
+			'drop function oldstyle_length(integer, text)');
+	}
+
+	if ($old_version lt '9.5')
+	{
+		# cope with changes of underlying functions
+		_add_st(
+			$result,
+			'regression',
+			'drop operator @#@ (NONE, bigint)',
+			'CREATE OPERATOR @#@ ('
+			  . 'PROCEDURE = factorial, RIGHTARG = bigint )',
+			'drop aggregate public.array_cat_accum(anyarray)',
+			'CREATE AGGREGATE array_larger_accum (anyarray) ' . ' ( '
+			  . '   sfunc = array_larger, '
+			  . '   stype = anyarray, '
+			  . '   initcond = $${}$$ ' . '  ) ');
+
+		# "=>" is no longer valid as an operator name
+		_add_st($result, 'regression',
+			'drop operator if exists public.=> (bigint, NONE)');
+	}
+
+	return $result;
+}
+
+# Internal subroutine to add statement(s) to the list for the given db.
+sub _add_st
+{
+	my ($result, $db, @st) = @_;
+
+	$result->{$db} ||= [];
+	push(@{ $result->{$db} }, @st);
+}
+
+=pod
+
+=item adjust_old_dumpfile($old_version, $dump)
+
+Edit a dump output file, taken from the adjusted old-version installation
+by current-version C<pg_dumpall -s>, so that it will match the results of
+C<pg_dumpall -s> on the pg_upgrade'd installation.
+
+Typically this involves coping with cosmetic differences in the output
+of backend subroutines used by pg_dump.
+
+Arguments:
+
+=over
+
+=item C<old_version>: Branch we are upgrading from.  This can be a branch
+name such as 'HEAD' or 'REL_11_STABLE', but it can also be any string
+that PostgreSQL::Version accepts.
+
+=item C<dump>: Contents of dump file
+
+=back
+
+Returns the modified dump text.
+
+=cut
+
+sub adjust_old_dumpfile
+{
+	my ($old_version, $dump) = @_;
+
+	# nothing to do for non-cross-version tests
+	return $dump if $old_version eq 'HEAD';
+
+	# convert branch name to numeric form
+	$old_version =~ s/REL_?(\d+(?:_\d+)?)_STABLE/$1/;
+	$old_version =~ s/_/./;
+	$old_version = PostgreSQL::Version->new($old_version);
+
+	# Version comments will certainly not match.
+	$dump =~ s/^-- Dumped from database version.*\n//mg;
+
+	if ($old_version >= 14 && $old_version < 16)
+	{
+		# Fix up some privilege-set discrepancies.
+		$dump =~
+		  s/^REVOKE SELECT,INSERT,REFERENCES,DELETE,TRIGGER,TRUNCATE,UPDATE ON TABLE/REVOKE ALL ON TABLE/mg;
+		$dump =~
+		  s/^GRANT SELECT,INSERT,REFERENCES,TRIGGER,TRUNCATE,UPDATE ON TABLE/GRANT SELECT,INSERT,REFERENCES,TRIGGER,TRUNCATE,MAINTAIN,UPDATE ON TABLE/mg;
+	}
+
+	if ($old_version < 14)
+	{
+		# Remove mentions of extended hash functions.
+		$dump =~
+		  s/^(\s+OPERATOR 1 =\(integer,integer\)) ,\n\s+FUNCTION 2 \(integer, integer\) public\.part_hashint4_noop\(integer,bigint\);/$1;/mg;
+		$dump =~
+		  s/^(\s+OPERATOR 1 =\(text,text\)) ,\n\s+FUNCTION 2 \(text, text\) public\.part_hashtext_length\(text,bigint\);/$1;/mg;
+	}
+
+	# Change trigger definitions to say ... EXECUTE FUNCTION ...
+	if ($old_version < 12)
+	{
+		# would like to use lookbehind here but perl complains
+		# so do it this way
+		$dump =~ s/
+			(^CREATE\sTRIGGER\s.*?)
+			\sEXECUTE\sPROCEDURE
+			/$1 EXECUTE FUNCTION/mgx;
+	}
+
+	if ($old_version lt '9.6')
+	{
+		# adjust some places where we don't print so many parens anymore
+		$dump =~
+		  s/^'New York'\tnew & york \| big & apple \| nyc\t'new' & 'york'\t\( 'new' & 'york' \| 'big' & 'appl' \) \| 'nyc'/'New York'\tnew & york | big & apple | nyc\t'new' & 'york'\t'new' & 'york' | 'big' & 'appl' | 'nyc'/mg;
+		$dump =~
+		  s/^'Sanct Peter'\tPeterburg \| peter \| 'Sanct Peterburg'\t'sanct' & 'peter'\t\( 'peterburg' \| 'peter' \) \| 'sanct' & 'peterburg'/'Sanct Peter'\tPeterburg | peter | 'Sanct Peterburg'\t'sanct' & 'peter'\t'peterburg' | 'peter' | 'sanct' & 'peterburg'/mg;
+	}
+
+	if ($old_version lt '9.5')
+	{
+		# adjust some places where we don't print so many parens anymore
+		$dump =~
+		  s/CONSTRAINT sequence_con CHECK \(\(\(\(x > 3\) AND \(y <> 'check failed'::text\)\) AND \(z < 8\)\)\)/CONSTRAINT sequence_con CHECK (((x > 3) AND (y <> 'check failed'::text) AND (z < 8)))/mg;
+		$dump =~
+		  s/CONSTRAINT copy_con CHECK \(\(\(\(x > 3\) AND \(y <> 'check failed'::text\)\) AND \(x < 7\)\)\)/CONSTRAINT copy_con CHECK (((x > 3) AND (y <> 'check failed'::text) AND (x < 7)))/mg;
+		$dump =~
+		  s/CONSTRAINT insert_con CHECK \(\(\(\(x >= 3\) AND \(y <> 'check failed'::text\)\) AND \(x < 8\)\)\)/CONSTRAINT insert_con CHECK (((x >= 3) AND (y <> 'check failed'::text) AND (x < 8)))/mg;
+		$dump =~
+		  s/DEFAULT \(\(-1\) \* currval\('public\.insert_seq'::regclass\)\)/DEFAULT ('-1'::integer * currval('public.insert_seq'::regclass))/mg;
+		$dump =~
+		  s/WHERE \(\(\(rsl\.sl_color = rsh\.slcolor\) AND \(rsl\.sl_len_cm >= rsh\.slminlen_cm\)\) AND \(rsl\.sl_len_cm <= rsh\.slmaxlen_cm\)\)/WHERE ((rsl.sl_color = rsh.slcolor) AND (rsl.sl_len_cm >= rsh.slminlen_cm) AND (rsl.sl_len_cm <= rsh.slmaxlen_cm))/mg;
+		$dump =~
+		  s/WHERE \(\(\(rule_and_refint_t3\.id3a = new\.id3a\) AND \(rule_and_refint_t3\.id3b = new\.id3b\)\) AND \(rule_and_refint_t3\.id3c = new\.id3c\)\)/WHERE ((rule_and_refint_t3.id3a = new.id3a) AND (rule_and_refint_t3.id3b = new.id3b) AND (rule_and_refint_t3.id3c = new.id3c))/mg;
+		$dump =~
+		  s/WHERE \(\(\(rule_and_refint_t3_1\.id3a = new\.id3a\) AND \(rule_and_refint_t3_1\.id3b = new\.id3b\)\) AND \(rule_and_refint_t3_1\.id3c = new\.id3c\)\)/WHERE ((rule_and_refint_t3_1.id3a = new.id3a) AND (rule_and_refint_t3_1.id3b = new.id3b) AND (rule_and_refint_t3_1.id3c = new.id3c))/mg;
+	}
+
+	if ($old_version lt '9.3')
+	{
+		# CREATE VIEW/RULE statements were not pretty-printed before 9.3.
+		# To cope, reduce all whitespace sequences within them to one space.
+		# This must be done on both old and new dumps.
+		$dump = _mash_view_whitespace($dump);
+
+		# _mash_view_whitespace doesn't handle multi-command rules;
+		# rather than trying to fix that, just hack the exceptions manually.
+		$dump =~
+		  s/CREATE RULE rtest_sys_del AS ON DELETE TO public\.rtest_system DO \(DELETE FROM public\.rtest_interface WHERE \(rtest_interface\.sysname = old\.sysname\); DELETE FROM public\.rtest_admin WHERE \(rtest_admin\.sysname = old\.sysname\); \);/CREATE RULE rtest_sys_del AS ON DELETE TO public.rtest_system DO (DELETE FROM public.rtest_interface WHERE (rtest_interface.sysname = old.sysname);\n DELETE FROM public.rtest_admin\n  WHERE (rtest_admin.sysname = old.sysname);\n);/m;
+		$dump =~
+		  s/CREATE RULE rtest_sys_upd AS ON UPDATE TO public\.rtest_system DO \(UPDATE public\.rtest_interface SET sysname = new\.sysname WHERE \(rtest_interface\.sysname = old\.sysname\); UPDATE public\.rtest_admin SET sysname = new\.sysname WHERE \(rtest_admin\.sysname = old\.sysname\); \);/CREATE RULE rtest_sys_upd AS ON UPDATE TO public.rtest_system DO (UPDATE public.rtest_interface SET sysname = new.sysname WHERE (rtest_interface.sysname = old.sysname);\n UPDATE public.rtest_admin SET sysname = new.sysname\n  WHERE (rtest_admin.sysname = old.sysname);\n);/m;
+
+		# and there's one place where pre-9.3 uses more aliases than we do now
+		$dump =~
+		  s/CREATE RULE rule_and_refint_t3_ins AS ON INSERT TO public\.rule_and_refint_t3 WHERE \(EXISTS \(SELECT 1 FROM public\.rule_and_refint_t3 WHERE \(\(rule_and_refint_t3\.id3a = new\.id3a\) AND \(rule_and_refint_t3\.id3b = new\.id3b\) AND \(rule_and_refint_t3\.id3c = new\.id3c\)\)\)\) DO INSTEAD UPDATE public\.rule_and_refint_t3 SET data = new\.data WHERE \(\(rule_and_refint_t3\.id3a = new\.id3a\) AND \(rule_and_refint_t3\.id3b = new\.id3b\) AND \(rule_and_refint_t3\.id3c = new\.id3c\)\);/CREATE RULE rule_and_refint_t3_ins AS ON INSERT TO public.rule_and_refint_t3 WHERE (EXISTS (SELECT 1 FROM public.rule_and_refint_t3 rule_and_refint_t3_1 WHERE ((rule_and_refint_t3_1.id3a = new.id3a) AND (rule_and_refint_t3_1.id3b = new.id3b) AND (rule_and_refint_t3_1.id3c = new.id3c)))) DO INSTEAD UPDATE public.rule_and_refint_t3 SET data = new.data WHERE ((rule_and_refint_t3.id3a = new.id3a) AND (rule_and_refint_t3.id3b = new.id3b) AND (rule_and_refint_t3.id3c = new.id3c));/m;
+
+		# Also fix old use of NATURAL JOIN syntax
+		$dump =~
+		  s/NATURAL JOIN public\.credit_card r/JOIN public.credit_card r USING (cid)/mg;
+		$dump =~
+		  s/NATURAL JOIN public\.credit_usage r/JOIN public.credit_usage r USING (cid)/mg;
+	}
+
+	# Suppress blank lines, as some places in pg_dump emit more or fewer.
+	$dump =~ s/\n\n+/\n/g;
+
+	return $dump;
+}
+
+# Internal subroutine to mangle whitespace within view/rule commands.
+# Any consecutive sequence of whitespace is reduced to one space.
+sub _mash_view_whitespace
+{
+	my ($dump) = @_;
+
+	foreach my $leader ('CREATE VIEW', 'CREATE RULE')
+	{
+		my @splitchunks = split $leader, $dump;
+
+		$dump = shift(@splitchunks);
+		foreach my $chunk (@splitchunks)
+		{
+			my @thischunks = split /;/, $chunk, 2;
+			my $stmt = shift(@thischunks);
+
+			# now $stmt is just the body of the CREATE VIEW/RULE
+			$stmt =~ s/\s+/ /sg;
+			# we also need to smash these forms for sub-selects and rules
+			$stmt =~ s/\( SELECT/(SELECT/g;
+			$stmt =~ s/\( INSERT/(INSERT/g;
+			$stmt =~ s/\( UPDATE/(UPDATE/g;
+			$stmt =~ s/\( DELETE/(DELETE/g;
+
+			$dump .= $leader . $stmt . ';' . $thischunks[0];
+		}
+	}
+	return $dump;
+}
+
+=pod
+
+=item adjust_new_dumpfile($old_version, $dump)
+
+Edit a dump output file, taken from the pg_upgrade'd installation
+by current-version C<pg_dumpall -s>, so that it will match the old
+dump output file as adjusted by C<adjust_old_dumpfile>.
+
+Typically this involves deleting data not present in the old installation.
+
+Arguments:
+
+=over
+
+=item C<old_version>: Branch we are upgrading from.  This can be a branch
+name such as 'HEAD' or 'REL_11_STABLE', but it can also be any string
+that PostgreSQL::Version accepts.
+
+=item C<dump>: Contents of dump file
+
+=back
+
+Returns the modified dump text.
+
+=cut
+
+sub adjust_new_dumpfile
+{
+	my ($old_version, $dump) = @_;
+
+	# nothing to do for non-cross-version tests
+	return $dump if $old_version eq 'HEAD';
+
+	# convert branch name to numeric form
+	$old_version =~ s/REL_?(\d+(?:_\d+)?)_STABLE/$1/;
+	$old_version =~ s/_/./;
+	$old_version = PostgreSQL::Version->new($old_version);
+
+	# Version comments will certainly not match.
+	$dump =~ s/^-- Dumped from database version.*\n//mg;
+
+	if ($old_version < 14)
+	{
+		# Suppress noise-word uses of IN in CREATE/ALTER PROCEDURE.
+		$dump =~ s/^(CREATE PROCEDURE .*?)\(IN /$1(/mg;
+		$dump =~ s/^(ALTER PROCEDURE .*?)\(IN /$1(/mg;
+		$dump =~ s/^(CREATE PROCEDURE .*?), IN /$1, /mg;
+		$dump =~ s/^(ALTER PROCEDURE .*?), IN /$1, /mg;
+		$dump =~ s/^(CREATE PROCEDURE .*?), IN /$1, /mg;
+		$dump =~ s/^(ALTER PROCEDURE .*?), IN /$1, /mg;
+
+		# Remove SUBSCRIPT clauses in CREATE TYPE.
+		$dump =~ s/^\s+SUBSCRIPT = raw_array_subscript_handler,\n//mg;
+
+		# Remove multirange_type_name clauses in CREATE TYPE AS RANGE.
+		$dump =~ s/,\n\s+multirange_type_name = .*?(,?)$/$1/mg;
+
+		# Remove mentions of extended hash functions.
+		$dump =~
+		  s/^ALTER OPERATOR FAMILY public\.part_test_int4_ops USING hash ADD\n\s+FUNCTION 2 \(integer, integer\) public\.part_hashint4_noop\(integer,bigint\);//mg;
+		$dump =~
+		  s/^ALTER OPERATOR FAMILY public\.part_test_text_ops USING hash ADD\n\s+FUNCTION 2 \(text, text\) public\.part_hashtext_length\(text,bigint\);//mg;
+	}
+
+	# pre-v12 dumps will not say anything about default_table_access_method.
+	if ($old_version < 12)
+	{
+		$dump =~ s/^SET default_table_access_method = heap;\n//mg;
+	}
+
+	# dumps from pre-9.6 dblink may include redundant ACL settings
+	if ($old_version lt '9.6')
+	{
+		$dump =~
+		  s/^--\n-- Name: FUNCTION dblink_connect_u\(text\); Type: ACL; Schema: public; Owner: .*\n--\n+REVOKE ALL ON FUNCTION public\.dblink_connect_u\(text\) FROM PUBLIC;\n+--\n-- Name: FUNCTION dblink_connect_u\(text, text\); Type: ACL; Schema: public; Owner: .*\n--\n+REVOKE ALL ON FUNCTION public\.dblink_connect_u\(text, text\) FROM PUBLIC;\n//mg;
+	}
+
+	if ($old_version lt '9.3')
+	{
+		# CREATE VIEW/RULE statements were not pretty-printed before 9.3.
+		# To cope, reduce all whitespace sequences within them to one space.
+		# This must be done on both old and new dumps.
+		$dump = _mash_view_whitespace($dump);
+	}
+
+	# Suppress blank lines, as some places in pg_dump emit more or fewer.
+	$dump =~ s/\n\n+/\n/g;
+
+	return $dump;
+}
+
+=pod
+
+=back
+
+=cut
+
+1;
diff -pudr client-code-REL_16.orig/PGBuild/Modules/TestUpgradeXversion.pm client-code-REL_16/PGBuild/Modules/TestUpgradeXversion.pm
--- client-code-REL_16.orig/PGBuild/Modules/TestUpgradeXversion.pm	2023-01-13 12:20:51.000000000 -0500
+++ client-code-REL_16/PGBuild/Modules/TestUpgradeXversion.pm	2023-01-14 14:23:27.120834037 -0500
@@ -323,31 +323,6 @@ sub save_for_testing
 		return if $?;
 	}
 
-	if ($this_branch ne 'HEAD' && $this_branch le 'REL9_4_STABLE')
-	{
-		my $opsql = 'drop operator if exists public.=> (bigint, NONE)';
-
-		# syntax is illegal in 9.5 and later, and it shouldn't
-		# be possible for it to exist there anyway.
-		# quoting the operator can also fail,  so it's left unquoted.
-		run_psql("$installdir/bin/psql", "-e", $opsql, "regression",
-			"$upgrade_loc/fix.log", 1);
-		return if $?;
-	}
-
-	# remove dbs of modules known to cause pg_upgrade to fail
-	# anything not builtin and incompatible should clean up its own db
-	# e.g. jsonb_set_lax
-
-	foreach my $bad_module ("test_ddl_deparse")
-	{
-		my $dsql = "drop database if exists contrib_regression_$bad_module";
-
-		run_psql("$installdir/bin/psql", "-e", $dsql,
-			"postgres", "$upgrade_loc/fix.log", 1);
-		return if $?;
-	}
-
 	# use a different logfile here to get around windows sharing issue
 	system( qq{"$installdir/bin/pg_ctl" -D "$installdir/data-C" -w stop }
 		  . qq{>> "$upgrade_loc/ctl2.log" 2>&1});
@@ -375,6 +350,12 @@ sub test_upgrade    ## no critic (Subrou
 	print time_str(), "checking upgrade from $oversion to $this_branch ...\n"
 	  if $verbose;
 
+	# load helper module from source tree
+	unshift(@INC, "$self->{pgsql}/src/test/perl");
+	require PostgreSQL::Test::AdjustUpgrade;
+	PostgreSQL::Test::AdjustUpgrade->import;
+	shift(@INC);
+
 	rmtree "$other_branch/inst/$upgrade_test";
 	copydir(
 		"$other_branch/inst/data-C",
@@ -414,6 +395,7 @@ sub test_upgrade    ## no critic (Subrou
 
 	return if $?;
 
+	# collect names of databases present in old installation.
 	my $sql = 'select datname from pg_database';
 
 	run_psql("psql", "-A -t", $sql, "postgres",
@@ -425,186 +407,19 @@ sub test_upgrade    ## no critic (Subrou
 	do { s/\r$//; $dbnames{$_} = 1; }
 	  foreach @dbnames;
 
-	if ($this_branch gt 'REL9_6_STABLE' || $this_branch eq 'HEAD')
-	{
-		run_psql(
-			"$other_branch/inst/bin/psql",                         "-e",
-			"drop database if exists contrib_regression_tsearch2", "postgres",
-			"$upgrade_loc/$oversion-copy.log",                     1
-		);
-		return if $?;
-
-		run_psql(
-			"$other_branch/inst/bin/psql",
-			"-e",
-			"drop function if exists oldstyle_length(integer, text)",
-			"regression",
-			"$upgrade_loc/$oversion-copy.log",
-			1
-		);
-		return if $?;
-	}
-
-	# some regression functions gone from release 11 on
-	if (   ($this_branch ge 'REL_11_STABLE' || $this_branch eq 'HEAD')
-		&& ($oversion lt 'REL_11_STABLE' && $oversion ne 'HEAD'))
-	{
-		my $missing_funcs = q{drop function if exists public.boxarea(box);
-                              drop function if exists public.funny_dup17();
-                            };
-		$missing_funcs =~ s/\n//g;
-
-		run_psql("$other_branch/inst/bin/psql", "-e", $missing_funcs,
-			"regression", "$upgrade_loc/$oversion-copy.log", 1);
-		return if $?;
-	}
-
-	# avoid version number issues with test_ext7
-	if ($dbnames{contrib_regression_test_extensions})
-	{
-		my $noext7 = "drop extension if exists test_ext7";
-		run_psql(
-			"$other_branch/inst/bin/psql", "-e", $noext7,
-			"contrib_regression_test_extensions",
-			"$upgrade_loc/$oversion-copy.log", 1
-		);
-		return if $?;
-	}
-
-	# user table OIDS and abstime+friends are gone from release 12 on
-	if (   ($this_branch gt 'REL_11_STABLE' || $this_branch eq 'HEAD')
-		&& ($oversion le 'REL_11_STABLE' && $oversion ne 'HEAD'))
-	{
-		my $nooid_stmt = q{
-           DO $stmt$
-           DECLARE
-              rec text;
-           BEGIN
-              FOR rec in
-                 select oid::regclass::text
-                 from pg_class
-                 where relname !~ '^pg_'
-                    and relhasoids
-                    and relkind in ('r','m')
-                 order by 1
-              LOOP
-                 execute 'ALTER TABLE ' || rec || ' SET WITHOUT OIDS';
-                 RAISE NOTICE 'removing oids from table %', rec;
-              END LOOP;
-           END; $stmt$;
-        };
-		foreach my $oiddb ("regression", "contrib_regression_btree_gist")
-		{
-			next unless $dbnames{$oiddb};
-			run_psql("$other_branch/inst/bin/psql", "-e", $nooid_stmt,
-				"$oiddb", "$upgrade_loc/$oversion-copy.log", 1);
-			return if $?;
-		}
-
-		if (   $oversion ge 'REL_10_STABLE'
-			&& $dbnames{'contrib_regression_postgres_fdw'})
-		{
-			run_psql(
-				"$other_branch/inst/bin/psql",
-				"-e",
-				"drop foreign table if exists ft_pg_type",
-				"contrib_regression_postgres_fdw",
-				"$upgrade_loc/$oversion-copy.log",
-				1
-			);
-			return if $?;
-		}
-
-		if ($oversion lt 'REL9_3_STABLE')
-		{
-			run_psql(
-				"$other_branch/inst/bin/psql",
-				"-e",
-				"drop table if exists abstime_tbl, reltime_tbl, tinterval_tbl",
-				"regression",
-				"$upgrade_loc/$oversion-copy.log",
-				1
-			);
-			return if $?;
-		}
-	}
-
-	# stuff not supported from release 14
-	if (   ($this_branch gt 'REL_13_STABLE' || $this_branch eq 'HEAD')
-		&& ($oversion le 'REL_13_STABLE' && $oversion ne 'HEAD'))
-	{
-		my $prstmt = join(';',
-			'drop operator if exists #@# (bigint,NONE)',
-			'drop operator if exists #%# (bigint,NONE)',
-			'drop operator if exists !=- (bigint,NONE)',
-			'drop operator if exists #@%# (bigint,NONE)');
-
-		run_psql("$other_branch/inst/bin/psql", "-e", $prstmt,
-			"regression", "$upgrade_loc/$oversion-copy.log", 1);
-		return if $?;
-
-		$prstmt = "drop function if exists public.putenv(text)";
-
-		my $regrdb =
-		  $oversion le "REL9_4_STABLE"
-		  ? "contrib_regression"
-		  : "contrib_regression_dblink";
-
-		if ($dbnames{$regrdb})
-		{
-			run_psql("$other_branch/inst/bin/psql", "-e", $prstmt,
-				"$regrdb", "$upgrade_loc/$oversion-copy.log", 1);
-			return if $?;
-		}
-
-		if ($oversion le 'REL9_4_STABLE')
-		{
-			# this is fixed in 9.5 and later
-			$prstmt = join(';',
-				'drop operator @#@ (NONE, bigint)',
-				'CREATE OPERATOR @#@ ('
-				  . 'PROCEDURE = factorial, '
-				  . 'RIGHTARG = bigint )');
-			run_psql("$other_branch/inst/bin/psql", "-e", $prstmt,
-				"regression", "$upgrade_loc/$oversion-copy.log", 1);
-			return if $?;
-		}
-
-		if ($oversion le 'REL9_4_STABLE')
-		{
-			# this is fixed in 9.5 and later
-			$prstmt = join(';',
-				'drop aggregate if exists public.array_cat_accum(anyarray)',
-				'CREATE AGGREGATE array_larger_accum (anyarray) ' . ' ( '
-				  . '   sfunc = array_larger, '
-				  . '   stype = anyarray, '
-				  . '   initcond = $${}$$ '
-				  . '  ) ');
-			run_psql("$other_branch/inst/bin/psql", "-e", $prstmt,
-				"regression", "$upgrade_loc/$oversion-copy.log", 1);
-			return if $?;
-		}
-	}
+	# obtain and execute commands needed to make old database upgradable.
+	my $adjust_cmds = adjust_database_contents($oversion, %dbnames);
 
-	# stuff not supported from release 16
-	if (   ($this_branch gt 'REL_15_STABLE' || $this_branch eq 'HEAD')
-		&& ($oversion le 'REL_15_STABLE' && $oversion ne 'HEAD'))
+	foreach my $updb (keys %$adjust_cmds)
 	{
-		# Can't upgrade aclitem in user tables from pre 16 to 16+.
-		# Also can't handle child tables with newly-generated columns.
-		my $prstmt = join(
-			';',
-			'alter table if exists public.tab_core_types
-						  drop column if exists aclitem',
-			'drop table if exists public.gtest_normal_child',
-			'drop table if exists public.gtest_normal_child2'
-		);
+		my $upcmds = join(";\n", @{ $adjust_cmds->{$updb} });
 
-		run_psql("$other_branch/inst/bin/psql", "-e", $prstmt,
-			"regression", "$upgrade_loc/$oversion-copy.log", 1);
+		run_psql("$other_branch/inst/bin/psql", "-e -v ON_ERROR_STOP=1",
+			$upcmds, $updb, "$upgrade_loc/$oversion-fix.log", 1);
 		return if $?;
 	}
 
+	# perform a dump from the old database for comparison purposes.
 	my $extra_digits = "";
 
 	if (   $oversion ne 'HEAD'
@@ -793,28 +608,27 @@ sub test_upgrade    ## no critic (Subrou
 		return if $?;
 	}
 
-	foreach my $dump ("$upgrade_loc/origin-$oversion.sql",
-		"$upgrade_loc/converted-$oversion-to-$this_branch.sql")
-	{
-		# Change trigger definitions to say ... EXECUTE FUNCTION ...
+	my $olddumpfile = "$upgrade_loc/origin-$oversion.sql";
+	my $dump        = file_contents($olddumpfile);
 
-		my $contents = file_contents($dump);
+	$dump = adjust_old_dumpfile($oversion, $dump);
 
-		# would like to use lookbehind here but perl complains
-		# so do it this way
-		$contents =~ s/
-                         (^CREATE\sTRIGGER\s.*?)
-                         \sEXECUTE\sPROCEDURE
-                      /$1 EXECUTE FUNCTION/mgx;
-		open(my $dh, '>', "$dump.fixed") || die "opening $dump.fixed";
-		print $dh $contents;
-		close($dh);
-	}
+	open(my $odh, '>', "$olddumpfile.fixed")
+	  || die "opening $olddumpfile.fixed: $!";
+	print $odh $dump;
+	close($odh);
 
-	system( qq{diff -I "^\$" -I "SET default_table_access_method = heap;" }
-		  . qq{ -I "^SET default_toast_compression = 'pglz';\$" -I "^-- " }
-		  . qq{-u "$upgrade_loc/origin-$oversion.sql.fixed" }
-		  . qq{"$upgrade_loc/converted-$oversion-to-$this_branch.sql.fixed" }
+	my $newdumpfile = "$upgrade_loc/converted-$oversion-to-$this_branch.sql";
+	$dump = file_contents($newdumpfile);
+
+	$dump = adjust_new_dumpfile($oversion, $dump);
+
+	open(my $ndh, '>', "$newdumpfile.fixed")
+	  || die "opening $newdumpfile.fixed: $!";
+	print $ndh $dump;
+	close($ndh);
+
+	system( qq{diff -u "$olddumpfile.fixed" "$newdumpfile.fixed" }
 		  . qq{> "$upgrade_loc/dumpdiff-$oversion" 2>&1});
 
 	# diff exits with status 1 if files differ
@@ -829,22 +643,7 @@ sub test_upgrade    ## no critic (Subrou
 	}
 	close($diffile);
 
-	# If the versions match we require that there be no diff lines.
-	# In the past we have seen a handful of diffs from reordering of
-	# large object output, but that appears to have disppeared.
-	# If the versions don't match we heuristically allow more lines of diffs
-	# based on observed differences. For versions from 9.6 on, that's
-	# not very many lines, though.
-
-	if (
-		($oversion eq $this_branch && $difflines == 0)
-		|| (   $oversion ne $this_branch
-			&& $oversion ge 'REL9_6_STABLE'
-			&& $difflines < 90)
-		|| (   $oversion ne $this_branch
-			&& $oversion lt 'REL9_6_STABLE'
-			&& $difflines < 700)
-	  )
+	if ($difflines == 0)
 	{
 		return 1;
 	}

Reply via email to