Re: [Proposal] Global temporary tables

> 2020年3月11日 下午3:52，Prabhat Sahu <prabhat(dot)sahu(at)enterprisedb(dot)com> 写道：
>
> On Mon, Mar 9, 2020 at 10:02 PM 曾文旌(义从) <wenjing(dot)zwj(at)alibaba-inc(dot)com <mailto:wenjing(dot)zwj(at)alibaba-inc(dot)com>> wrote:
>
>
> Fixed in global_temporary_table_v18-pg13.patch.
> Hi Wenjing,
> Thanks for the patch. I have verified the previous issues with "gtt_v18_pg13.patch" and those are resolved.
> Please find below case:
>
> postgres=# create sequence seq;
> CREATE SEQUENCE
>
> postgres=# CREATE GLOBAL TEMPORARY TABLE gtt1(c1 int PRIMARY KEY) ON COMMIT DELETE ROWS;
> CREATE TABLE
>
> postgres=# CREATE GLOBAL TEMPORARY TABLE gtt2(c1 int PRIMARY KEY) ON COMMIT PRESERVE ROWS;
> CREATE TABLE
>
> postgres=# alter table gtt1 add c2 int default nextval('seq');
> ERROR: cannot reindex global temporary tables
>
> postgres=# alter table gtt2 add c2 int default nextval('seq');
> ERROR: cannot reindex global temporary tables
>
> Note: We are getting this error if we have a key column(PK/UNIQUE) in a GTT, and trying to add a column with a default sequence into it.
This is because alter table add column with default value need reindex pk,
reindex need change relfilenode, but GTT is not currently supported.
I make the error message more clearer in global_temporary_table_v19-pg13.patch

Wenjing

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