Re: Added schema level support for publication.

On Wed, Jul 14, 2021 at 6:25 PM houzj(dot)fnst(at)fujitsu(dot)com
<houzj(dot)fnst(at)fujitsu(dot)com> wrote:
>
> Wednesday, July 14, 2021 6:17 PM vignesh C <vignesh21(at)gmail(dot)com> wrote:
> > On Tue, Jul 13, 2021 at 12:06 PM tanghy(dot)fnst(at)fujitsu(dot)com
> > <tanghy(dot)fnst(at)fujitsu(dot)com> wrote:
> > >
> > > On Monday, July 12, 2021 5:36 PM vignesh C <vignesh21(at)gmail(dot)com> wrote:
> > > >
> > > > Thanks for reporting this issue, this issue is fixed in the v10
> > > > patch attached at [1].
> > > > [1] - https://www.postgresql.org/message-id/CALDaNm2%2BtR%2B8R-
> > > > sD1CSyMbZcZbkintZE-avefjsp7LCkm6HMmw%40mail.gmail.com
> > >
> > > Thanks for fixing it.
> > >
> > > By applying your V10 patch, I saw three problems, please have a look.
> > >
> > > 1. An issue about pg_dump.
> > > When public schema was published, the publication was created in the
> > > output file, but public schema was not added to it. (Other schemas
> > > could be added as expected.)
> > >
> > > I looked into it and found that selectDumpableNamespace function marks
> > DUMP_COMPONENT_DEFINITION as needless when the schema is public,
> > leading to schema public is ignored in getPublicationSchemas. So we'd better
> > check whether schemas should be dumped in another way.
> > >
> > > I tried to fix it with the following change, please have a look.
> > > (Maybe we also need to add some comments for it.)
> > >
> > > diff --git a/src/bin/pg_dump/pg_dump.c b/src/bin/pg_dump/pg_dump.c
> > > index f6b4f12648..a327d2568b 100644
> > > --- a/src/bin/pg_dump/pg_dump.c
> > > +++ b/src/bin/pg_dump/pg_dump.c
> > > @@ -4206,7 +4206,8 @@ getPublicationSchemas(Archive *fout,
> > NamespaceInfo nspinfo[], int numSchemas)
> > > * Ignore publication membership of schemas whose
> > definitions are not
> > > * to be dumped.
> > > */
> > > - if (!(nsinfo->dobj.dump &
> > DUMP_COMPONENT_DEFINITION))
> > > + if (!((nsinfo->dobj.dump &
> > DUMP_COMPONENT_DEFINITION)
> > > + || (strcmp(nsinfo->dobj.name, "public") == 0
> > > + && nsinfo->dobj.dump != DUMP_COMPONENT_NONE)))
> > > continue;
> > >
> > > pg_log_info("reading publication membership for schema
> > > \"%s\"",
> >
> > I felt it is intentionally done like that as the pubic schema is created by default,
> > hence it is not required to dump else we will get errors while restoring.
> > Thougths?
>
> Thanks for the new patches and I also looked at this issue.
>
> For user defined schema and publication:
> --------------------------
> create schema s1;
> create publication pub2 for SCHEMA s1;
> --------------------------
>
> pg_dump will only generate the following SQLs:
>
> ------pg_dump result------
> CREATE PUBLICATION pub2 WITH (publish = 'insert, update, delete, truncate');
> ALTER PUBLICATION pub2 ADD SCHEMA s1;
> --------------------------
>
> But for the public schema:
> --------------------------
> create publication pub for SCHEMA public;
> --------------------------
>
> pg_dump will only generate the following SQL:
>
> ------pg_dump result------
> CREATE PUBLICATION pub WITH (publish = 'insert, update, delete, truncate');
> --------------------------
>
> It didn't generate SQL like "ALTER PUBLICATION pub ADD SCHEMA public;" which
> means the public schema won't be published after restoring. So, I think we'd
> better let the pg_dump generate the ADD SCHEMA public SQL. Thoughts ?

Thanks for reporting this issue, this issue is fixed in the v12 patch attached.

Regards,
Vignesh