Re: Conflict detection and logging in logical replication

On Thu, Jul 18, 2024 at 7:52 AM Zhijie Hou (Fujitsu)
<houzj.fnst@fujitsu.com> wrote:
>
> Attach the V5 patch set which changed the following:
>

Tested v5-0001 patch, and it fails to detect the update_exists
conflict for a setup where Pub has a non-partitioned table and Sub has
the same table partitioned.
Below is a testcase showcasing the issue:

Setup:
Pub:
create table tab (a int not null, b int not null);
alter table tab add constraint tab_pk primary key (a,b);

Sub:
create table tab (a int not null, b int not null) partition by range (b);
alter table tab add constraint tab_pk primary key (a,b);
CREATE TABLE tab_1 PARTITION OF tab FOR VALUES FROM (MINVALUE) TO (100);
CREATE TABLE tab_2 PARTITION OF tab FOR VALUES FROM (101) TO (MAXVALUE);

Test:
Pub: insert into tab values (1,1);
Sub: insert into tab values (2,1);
Pub: update tab set a=2 where a=1;    --> After this update on Pub,
'update_exists' is expected on Sub, but it fails to detect the
conflict and logs the key violation error -

ERROR:  duplicate key value violates unique constraint "tab_1_pkey"
DETAIL:  Key (a, b)=(2, 1) already exists.

Thanks,
Nisha