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Add test coverage for "unchanged toast column" replication code path.

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It seems pretty unacceptable to have no regression test coverage
for this aspect of the logical replication protocol, especially
given the bugs we've found in related code.

Discussion: https://postgr.es/m/16129-a0c0f48e71741e5f@postgresql.org
This commit is contained in:
Tom Lane 2019-11-22 12:52:26 -05:00
parent b72a44c51a
commit 785206afdf
1 changed files with 30 additions and 1 deletions
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31
src/test/subscription/t/001_rep_changes.pl
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@ -3,7 +3,7 @@ use strict;
use warnings;
use PostgresNode;
use TestLib;
use Test::More tests => 20;
use Test::More tests => 22;
# Initialize publisher node
my $node_publisher = get_new_node('publisher');
@ -169,9 +169,38 @@ is( $result, qq(local|1.1|baz|1
local|2.2|bar|2),
'update works with different column order and subscriber local values');
# check behavior with toasted values
$node_publisher->safe_psql('postgres',
"UPDATE tab_mixed SET b = repeat('xyzzy', 100000) WHERE a = 2");
$node_publisher->wait_for_catchup($appname);
$result = $node_subscriber->safe_psql('postgres',
"SELECT a, length(b), c, d FROM tab_mixed ORDER BY a");
is( $result, qq(1|3|1.1|local
2|500000|2.2|local),
'update transmits large column value');
$node_publisher->safe_psql('postgres',
"UPDATE tab_mixed SET c = 3.3 WHERE a = 2");
$node_publisher->wait_for_catchup($appname);
$result = $node_subscriber->safe_psql('postgres',
"SELECT a, length(b), c, d FROM tab_mixed ORDER BY a");
is( $result, qq(1|3|1.1|local
2|500000|3.3|local),
'update with non-transmitted large column value');
# check behavior with dropped columns
# this update should get transmitted before the column goes away
$node_publisher->safe_psql('postgres',
"UPDATE tab_mixed SET b = 'bar', c = 2.2 WHERE a = 2");
$node_publisher->safe_psql('postgres', "ALTER TABLE tab_mixed DROP COLUMN b");
$node_publisher->safe_psql('postgres',
"UPDATE tab_mixed SET c = 11.11 WHERE a = 1");