Re: Refresh Publication takes hours and doesn´t finish

On 2019-05-20 23:30, Tom Lane wrote:
> Hmm ... given that pg_get_publication_tables() shouldn't return any
> duplicate OIDs, it does seem unnecessarily inefficient to put it in
> an IN-subselect condition.  Peter, is there a reason why this isn't
> a straight lateral join?  I get a much saner-looking plan from
> 
>     FROM pg_publication P, pg_class C
> -        JOIN pg_namespace N ON (N.oid = C.relnamespace)
> -   WHERE C.oid IN (SELECT relid FROM pg_get_publication_tables(P.pubname));
> +        JOIN pg_namespace N ON (N.oid = C.relnamespace),
> +        LATERAL pg_get_publication_tables(P.pubname)
> +   WHERE C.oid = pg_get_publication_tables.relid;

No reason I think, just didn't quite manage to recognize the possibility
of using LATERAL at the time.

-- 
Peter Eisentraut              http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services