On 2014-09-03 09:31:50 -0400, Robert Haas wrote:
> On Fri, Aug 29, 2014 at 1:26 PM, Andres Freund <and...@2ndquadrant.com> wrote:
> > We have pg_get_serial_sequence() mapping (relation, colum) to the
> > sequence. What I'm missing right now is the inverse. I.e. given a
> > sequence tell me the owner.
> > describe.c has a query for that, and it's not too hard to write, but it
> > still seems 'unfriendly' not to provide it.
> >
> > Does anybody dislike adding a function for that?
>
> I'll go out on a limb and say that it sounds like pointless catalog
> bloat to me. I am all in favor of adding things like this where the
> SQL query is painful to write (e.g. things involving pg_depend) but if
> it's a simple SELECT query then, eh, not really excited about it.
There's not really a simple select for it, is there? psql uses:
/* Get the column that owns this sequence */
printfPQExpBuffer(&buf, "SELECT pg_catalog.quote_ident(nspname)
|| '.' ||"
"\n
pg_catalog.quote_ident(relname) || '.' ||"
"\n
pg_catalog.quote_ident(attname)"
"\nFROM pg_catalog.pg_class c"
"\nINNER JOIN pg_catalog.pg_depend d ON
c.oid=d.refobjid"
"\nINNER JOIN pg_catalog.pg_namespace n ON
n.oid=c.relnamespace"
"\nINNER JOIN
pg_catalog.pg_attribute a ON ("
"\n a.attrelid=c.oid AND"
"\n a.attnum=d.refobjsubid)"
"\nWHERE
d.classid='pg_catalog.pg_class'::pg_catalog.regclass"
"\n AND
d.refclassid='pg_catalog.pg_class'::pg_catalog.regclass"
"\n AND d.objid=%s"
"\n AND d.deptype='a'",
oid);
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
--
Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-hackers
