2017-01-25 15:07 GMT+01:00 Alvaro Herrera <alvhe...@2ndquadrant.com>:
> Tom Lane wrote: > > Andres Freund <and...@anarazel.de> writes: > > > On 2017-01-24 21:32:56 -0300, Alvaro Herrera wrote: > > >> XMLTABLE is specified by the standard to return multiple rows ... but > > >> then as far as my reading goes, it is only supposed to be supported in > > >> the range table (FROM clause) not in the target list. I wonder if > > >> this would end up better if we only tried to support it in RT. I > asked > > >> Pavel to implement it like that a few weeks ago, but ... > > > > > Right - it makes sense in the FROM list - but then it should be an > > > executor node, instead of some expression thingy. > > > > +1 --- we're out of the business of having simple expressions that > > return rowsets. > > Well, that's it. I'm not committing this patch against two other > committers' opinion, plus I was already on the fence about the > implementation anyway. I think you should just go with the flow and > implement this by creating nodeTableexprscan.c. It's not even > difficult. > I am playing with this and the patch looks about 15kB longer - just due implementation basic scan functionality - and I didn't touch a planner. I am not happy from this - still I have a feeling so I try to reimplement reduced SRF. Regards Pavel > > -- > Álvaro Herrera https://www.2ndQuadrant.com/ > PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services >
