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Re: [Proposal] Global temporary tables - Mailing list pgsql-hackers

From Prabhat Sahu
Subject Re: [Proposal] Global temporary tables
Date
Msg-id CANEvxPpMNnbkZ81U3i-PJwpzdCBxf1Db52xaQ=bjU=x3EJzdWA@mail.gmail.com
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In response to Re: [Proposal] Global temporary tables  (Prabhat Sahu <prabhat.sahu@enterprisedb.com>)
Responses Re: [Proposal] Global temporary tables  (Pavel Stehule <pavel.stehule@gmail.com>)
Re: [Proposal] Global temporary tables  (wjzeng <wenjing.zwj@alibaba-inc.com>)
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Hi All,

Please check the behavior of GTT  having column with "SERIAL" datatype and column with default value as "SEQUENCE" as below:

Session1:
postgres=# create sequence gtt_c3_seq;
CREATE SEQUENCE
postgres=# create global temporary table gtt(c1 int, c2 serial, c3 int default nextval('gtt_c3_seq') not null) on commit preserve rows;
CREATE TABLE

-- Structure of column c2 and c3 are similar:
postgres=# \d+ gtt
                                                Table "public.gtt"
 Column |  Type   | Collation | Nullable |             Default             | Storage | Stats target | Description
--------+---------+-----------+----------+---------------------------------+---------+--------------+-------------
 c1     | integer |           |          |                                 | plain   |              |
 c2     | integer |           | not null | nextval('gtt_c2_seq'::regclass) | plain   |              |
 c3     | integer |           | not null | nextval('gtt_c3_seq'::regclass) | plain   |              |
Access method: heap
Options: on_commit_delete_rows=false

postgres=# insert into gtt select generate_series(1,3);
INSERT 0 3
postgres=# select * from gtt;
 c1 | c2 | c3
----+----+----
  1 |  1 |  1
  2 |  2 |  2
  3 |  3 |  3
(3 rows)

Session2:
postgres=# insert into gtt select generate_series(1,3);
INSERT 0 3
postgres=# select * from gtt;
 c1 | c2 | c3
----+----+----
  1 |  1 |  4
  2 |  2 |  5
  3 |  3 |  6
(3 rows)

Kindly let me know, Is this behavior expected?

--

With Regards,
Prabhat Kumar Sahu
EnterpriseDB: http://www.enterprisedb.com

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