Horton

Re: [Proposal] Global temporary tables

曾文旌 (义从) <wenjing.zwj@alibaba-inc.com>

View thread
From: 曾文旌(义从) <wenjing.zwj@alibaba-inc.com>
To: Prabhat Sahu <prabhat.sahu@enterprisedb.com>, Pavel Stehule <pavel.stehule@gmail.com>
Cc: "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: 2020-02-25T08:53:21Z
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.


> 2020年2月24日 下午9:41，Pavel Stehule <pavel.stehule@gmail.com> 写道：
> 
> 
> 
> po 24. 2. 2020 v 14:34 odesílatel Prabhat Sahu <prabhat.sahu@enterprisedb.com <mailto:prabhat.sahu@enterprisedb.com>> napsal:
> Hi All,
> 
> I observe a different behavior in  "temporary table" and "global temporary table".
> Not sure if it is expected?
> 
> postgres=# create global temporary table parent1(a int)  on commit delete rows;
> CREATE TABLE
> postgres=# create global temporary table child1() inherits (parent1);
> CREATE TABLE
> postgres=# insert into parent1 values(1);
> INSERT 0 1
> postgres=# insert into child1 values(2);
> INSERT 0 1
> postgres=# select * from parent1;
>  a 
> ---
> (0 rows)
> 
> postgres=# select * from child1;
>  a 
> ---
> (0 rows)
> 
> It is bug. Probably INHERITS clause is not well implemented for GTT
I fixed the GTT's behavior, like local temp table.


Wenjing



> 
> 
> 
> 
> postgres=# create temporary table parent2(a int)  on commit delete rows;
> CREATE TABLE
> postgres=# create temporary table child2() inherits (parent2);
> CREATE TABLE
> postgres=# insert into parent2 values(1);
> INSERT 0 1
> postgres=# insert into child2 values(2);
> INSERT 0 1
> postgres=# select * from parent2;
>  a 
> ---
>  2
> (1 row)
> 
> postgres=# select * from child2;
>  a 
> ---
>  2
> (1 row)
> 
> 
> Thanks,
> Prabhat Sahu
>