Re: [BUGS] COPY .. FREEZE, (apparently) not working on 9.6

Hello,

While testing "COPY/ FREEZE" feature, I've found a weird issue, by which I am unable to actually freeze the rows/tables when using psql 9.6. Or, at least, so it looks when inspecting 'xmin'..

Here is the actual (failing) output from running a simple COPY/FREEZE snippet against postgres 9.6.2 (x86_64) on CentOS:

# /usr/pgsql-9.6/bin/psql -U postgres -h localhost

postgres=# BEGIN;

BEGIN

postgres=# CREATE TABLE da (text text);

CREATE TABLE

postgres=# COPY da FROM STDIN WITH (DELIMITER ',', FREEZE);

sample

\.

COPY 1

postgres=# COMMIT;

COMMIT

postgres=# select xmin,xmax from da;

 xmin | xmax

—----+------

 1679 | 0

(1 row)

However, this same snipped when run against 9.3.16, actually works, and reports the expected xmin=2 value:

# /usr/pgsql-9.3/bin/psql -U postgres -h localhost

postgres=# BEGIN;

BEGIN

postgres=# CREATE TABLE da (text text);

CREATE TABLE

postgres=# COPY da FROM STDIN WITH (DELIMITER ',', FREEZE);

sample

\.

COPY 1

postgres=# COMMIT;

COMMIT

postgres=# select xmin,xmax from da;

 xmin | xmax

—----+------

    2    |   0

(1 row)

Both databases are just fresh installed, have no other users/sessions concurrently, and have the same (default/basic) configuration.

Also, quite a similar issue happens when issuing a "VACUUM FREEZE da" after COPY (w/o freeze): on 9.3 rows are frozen (xmin=2), while on 9.6 it just like if VACUUM FREEZE is simply ignored.. :?