Re: Removing pg_migrator limitations

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От Bruce Momjian
Тема Re: Removing pg_migrator limitations
Дата
Msg-id 200912182145.nBILjNc11671@momjian.us
обсуждение исходный текст
Ответ на Re: Removing pg_migrator limitations  (Alvaro Herrera <alvherre@commandprompt.com>)
Ответы Re: Removing pg_migrator limitations  (Alvaro Herrera <alvherre@commandprompt.com>)
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Alvaro Herrera wrote:
> Bruce Momjian wrote:
> > Alvaro Herrera wrote:
> > > Bruce Momjian wrote:
> > > > There are several pg_migrator limitations that appeared late in the 8.4
> > > > development cycle and were impossible to fix at that point.  I would
> > > > like to fix them for Postgres 8.5:
> > > > 
> > > >         o  a user-defined composite data type
> > > >         o  a user-defined array data type
> > > >         o  a user-defined enum data type
> > > > 
> > > > I have discussed this with Alvaro.  I think pg_migrator needs the
> > > > ability to set the pg_type.oid and pg_enum.oid for user-defined
> > > > composites, arrays, and enums to match the values in the old server, and
> > > > hence match references to those rows in user data tables.
> > > 
> > > To be more precise, the pg_enum.oid needs to be set for ENUM types;
> > > there's no need for setting the pg_type.oid (for ENUM types).  I don't
> > > know about composites but I think the problem with user defined arrays
> > > is the OID of the element type, not the array itself.
> > 
> > Yes, good point.  I can see where the oids are assigned in our C code:
> > 
> >         oids[i] = GetNewOid(pg_enum);
> > 
> >     array_oid = GetNewOid(pg_type);
> > 
> > I need a way of controlling that.
> 
> You're (partly?) missing my point which is that the important OID to
> control is the one that actually gets stored on table files.

Well, I thought the idea was to set the system table oid to match the
oids already in the user tables.  I realize that is not all system oids.
What am I missing exactly?

--  Bruce Momjian  <bruce@momjian.us>        http://momjian.us EnterpriseDB
http://enterprisedb.com
 + If your life is a hard drive, Christ can be your backup. +


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