2018-02-12 18:17 GMT+01:00 Peter Eisentraut < peter.eisentr...@2ndquadrant.com>:
> On 2/9/18 09:42, Tom Lane wrote: > > Meh. It doesn't look significantly different to me than the restriction > > that you can't have sub-selects in CHECK expressions, index expressions, > > etc. Obviously we need a clean failure like you get for those cases. > > But otherwise it's an OK restriction that stems from exactly the same > > cause: we do not want to invoke the full planner in this context (and > > even if we did, we don't want to use the full executor to execute the > > result). > > A close analogy is that EXECUTE parameters also don't accept subqueries. > It would perhaps be nice if that could be made to work, but as > discussed it would require a bunch more work. > I can live with it. Should be well documented and explained. Regards Pavel > > -- > Peter Eisentraut http://www.2ndQuadrant.com/ > PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services >
