Re: Support logical replication of DDLs

On Tue, Jun 6, 2023 at 11:31 AM Wei Wang (Fujitsu)
<wangw.fnst@fujitsu.com> wrote:
>
> On Thur, June 1, 2023 at 23:42 vignesh C <vignesh21@gmail.com> wrote:
> > On Wed, 31 May 2023 at 14:32, Wei Wang (Fujitsu) <wangw.fnst@fujitsu.com>
> > wrote:
> > > ~~~
> > >
> > > 2. Deparsed results of the partition table.
> > > When I run the following SQLs:
> > > ```
> > > create table parent (a int primary key) partition by range (a);
> > > create table child partition of parent default;
> > > ```
> > >
> > > I got the following two deparsed results:
> > > ```
> > > CREATE  TABLE  public.parent (a pg_catalog.int4 STORAGE PLAIN      ,
> > CONSTRAINT parent_pkey PRIMARY KEY (a))  PARTITION BY RANGE (a)
> > > CREATE  TABLE  public.child PARTITION OF public.parent (CONSTRAINT
> > child_pkey PRIMARY KEY (a)) DEFAULT
> > > ```
> > >
> > > When I run these two deparsed results on another instance, I got the following
> > error:
> > > ```
> > > postgres=# CREATE  TABLE  public.parent (a pg_catalog.int4 STORAGE PLAIN      ,
> > CONSTRAINT parent_pkey PRIMARY KEY (a))  PARTITION BY RANGE (a);
> > > CREATE TABLE
> > > postgres=# CREATE  TABLE  public.child PARTITION OF public.parent
> > (CONSTRAINT child_pkey PRIMARY KEY (a)) DEFAULT;
> > > ERROR:  multiple primary keys for table "child" are not allowed
> > > ```
> > >
> > > I think that we could skip deparsing the primary key related constraint for
> > > partition (child) table in the function obtainConstraints for this case.
> >
> > Not applicable for 0008 patch
>
> I think this issue still exists after applying the 0008 patch. Is this error the
> result we expected?
> If no, I think we could try to address this issue in the function
> deparse_Constraints_ToJsonb in 0008 patch like the attachment. What do you
> think? BTW, we also need to skip the parentheses in the above case if you think
> this approach is OK.
>

Thank You Wang-san for the patch, we have included the fix after
slight modification in the latest patch-set (*2023_06_08.patch).

thanks
Shveta