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Set ActiveSnapshot when logically replaying inserts 

Input functions for the inserted tuples may require a snapshot, when
they are replayed by native logical replication.  An example is a domain
with a constraint using a SQL-language function, which prior to this
commit failed to apply on the subscriber side.

Reported-by: Mai Peng <maily.peng@webedia-group.com>
Co-authored-by: Minh-Quan TRAN <qtran@itscaro.me>
Co-authored-by: Álvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://postgr.es/m/4EB4BD78-BFC3-4D04-B8DA-D53DF7160354@webedia-group.com
Discussion: https://postgr.es/m/153211336163.1404.11721804383024050689@wrigleys.postgresql.org
This commit is contained in:
Alvaro Herrera 2018-07-30 16:30:07 -04:00
parent 70de0abdb7
commit 4f10e7ea7b
2 changed files with 25 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
src/backend/replication/logical/worker.c
View File

@ -610,13 +610,15 @@ apply_handle_insert(StringInfo s)
remoteslot = ExecInitExtraTupleSlot(estate,
RelationGetDescr(rel->localrel));
/* Input functions may need an active snapshot, so get one */
PushActiveSnapshot(GetTransactionSnapshot());
/* Process and store remote tuple in the slot */
oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
slot_store_cstrings(remoteslot, rel, newtup.values);
slot_fill_defaults(rel, estate, remoteslot);
MemoryContextSwitchTo(oldctx);
PushActiveSnapshot(GetTransactionSnapshot());
ExecOpenIndices(estate->es_result_relation_info, false);
/* Do the insert. */

24
src/test/subscription/t/002_types.pl
View File

@ -4,7 +4,7 @@ use strict;
use warnings;
use PostgresNode;
use TestLib;
use Test::More tests => 3;
use Test::More tests => 4;
# Initialize publisher node
my $node_publisher = get_new_node('publisher');
@ -90,7 +90,13 @@ my $ddl = qq(
CREATE TABLE public.tst_hstore (
a INTEGER PRIMARY KEY,
b public.hstore
););
);
SET check_function_bodies=off;
CREATE FUNCTION public.monot_incr(int) RETURNS bool LANGUAGE sql
AS ' select \$1 > max(a) from public.tst_dom_constr; ';
CREATE DOMAIN monot_int AS int CHECK (monot_incr(VALUE));
CREATE TABLE public.tst_dom_constr (a monot_int););
# Setup structure on both nodes
$node_publisher->safe_psql('postgres', $ddl);
@ -240,6 +246,9 @@ $node_publisher->safe_psql(
(2, '"zzz"=>"foo"'),
(3, '"123"=>"321"'),
(4, '"yellow horse"=>"moaned"');
-- tst_dom_constr
INSERT INTO tst_dom_constr VALUES (10);
));
$node_publisher->wait_for_catchup($appname);
@ -541,5 +550,16 @@ e|{e,d}
4|"yellow horse"=>"moaned"',
'check replicated deletes on subscriber');
# Test a domain with a constraint backed by a SQL-language function,
# which needs an active snapshot in order to operate.
$node_publisher->safe_psql('postgres', "INSERT INTO tst_dom_constr VALUES (11)");
$node_subscriber->poll_query_until('postgres', $synced_query)
or die "Timed out while waiting for subscriber to synchronize data";
$result =
$node_subscriber->safe_psql('postgres', "SELECT sum(a) FROM tst_dom_constr");
is($result, '21', 'sql-function constraint on domain');
$node_subscriber->stop('fast');
$node_publisher->stop('fast');