Horton

Re: [Proposal] Global temporary tables

Prabhat Sahu <prabhat.sahu@enterprisedb.com>

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From: Prabhat Sahu <prabhat.sahu@enterprisedb.com>
To: 曾文旌(义从) <wenjing.zwj@alibaba-inc.com>
Cc: tushar <tushar.ahuja@enterprisedb.com>, Pavel Stehule <pavel.stehule@gmail.com>, Robert Haas <robertmhaas@gmail.com>, Tomas Vondra <tomas.vondra@2ndquadrant.com>, Konstantin Knizhnik <k.knizhnik@postgrespro.ru>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>, 蔡松露(子嘉) <zijia@taobao.com>, "Cai, Le" <le.cai@alibaba-inc.com>, 萧少聪(铁庵) <shaocong.xsc@alibaba-inc.com>
Date: 2020-03-25T12:52:55Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. PageAddItemExtended(): Add LP_UNUSED assertion.

  2. Remove temporary files after backend crash

  3. Fix comment in indexing.c

  4. Fix failure to ignore leftover temp tables after a server crash.

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