Re: [Proposal] Global temporary tables

> 2020年2月25日 下午9:36，Prabhat Sahu <prabhat(dot)sahu(at)enterprisedb(dot)com> 写道：
>
> Hi All,
>
> Please check the below findings on GTT.
> -- Scenario 1:
> Under "information_schema", We are not allowed to create "temporary table", whereas we can CREATE/DROP "Global Temporary Table", is it expected ?
>
> postgres=# create temporary table information_schema.temp1(c1 int);
> ERROR: cannot create temporary relation in non-temporary schema
> LINE 1: create temporary table information_schema.temp1(c1 int);
> ^
>
> postgres=# create global temporary table information_schema.temp1(c1 int);
> CREATE TABLE
>
> postgres=# drop table information_schema.temp1 ;
> DROP TABLE
>
> -- Scenario 2:
> Here I am getting the same error message in both the below cases.
> We may add a "global" keyword with GTT related error message.
>
> postgres=# create global temporary table gtt1 (c1 int unique);
> CREATE TABLE
> postgres=# create temporary table tmp1 (c1 int unique);
> CREATE TABLE
>
> postgres=# create temporary table tmp2 (c1 int references gtt1(c1) );
> ERROR: constraints on temporary tables may reference only temporary tables
>
> postgres=# create global temporary table gtt2 (c1 int references tmp1(c1) );
> ERROR: constraints on temporary tables may reference only temporary tables
Fixed in global_temporary_table_v15-pg13.patch

Wenjing

>
> Thanks,
> Prabhat Sahu
>
> On Tue, Feb 25, 2020 at 2:25 PM 曾文旌(义从) <wenjing(dot)zwj(at)alibaba-inc(dot)com <mailto:wenjing(dot)zwj(at)alibaba-inc(dot)com>> wrote:
>
>
>> 2020年2月24日 下午5:44，Prabhat Sahu <prabhat(dot)sahu(at)enterprisedb(dot)com <mailto:prabhat(dot)sahu(at)enterprisedb(dot)com>> 写道：
>>
>> On Fri, Feb 21, 2020 at 9:10 PM 曾文旌(义从) <wenjing(dot)zwj(at)alibaba-inc(dot)com <mailto:wenjing(dot)zwj(at)alibaba-inc(dot)com>> wrote:
>> Hi,
>> I have started testing the "Global temporary table" feature,
>> That's great, I see hope.
>> from "gtt_v11-pg13.patch". Below is my findings:
>>
>> -- session 1:
>> postgres=# create global temporary table gtt1(a int);
>> CREATE TABLE
>>
>> -- seeeion 2:
>> postgres=# truncate gtt1 ;
>> ERROR: could not open file "base/13585/t3_16384": No such file or directory
>>
>> is it expected?
>>
>> Oh ,this is a bug, I fixed it.
>> Thanks for the patch.
>> I have verified the same, Now the issue is resolved with v12 patch.
>>
>> Kindly confirm the below scenario:
>>
>> postgres=# create global temporary table gtt1 (c1 int unique);
>> CREATE TABLE
>>
>> postgres=# create global temporary table gtt2 (c1 int references gtt1(c1) );
>> ERROR: referenced relation "gtt1" is not a global temp table
>>
>> postgres=# create table tab2 (c1 int references gtt1(c1) );
>> ERROR: referenced relation "gtt1" is not a global temp table
>>
>> Thanks,
>> Prabhat Sahu
>
> GTT supports foreign key constraints in global_temporary_table_v13-pg13.patch
>
>
> Wenjing
>
>
>
>
>
> --
> With Regards,
> Prabhat Kumar Sahu
> EnterpriseDB: http://www.enterprisedb.com <http://www.enterprisedb.com/>