Обсуждение: using of select (myfunction()).* is so slow
Hi all, im using a function of my own in a subquery, and when wonderig about the slowliness of this one, y relalize that: test=# SELECT (_xxfunction(854,'711H',11,false)).* ; (4 filas) --Result DELETED Duración: 1069,465 ms glyms=# SELECT * from _xxfunction(854,'711H',11,false) ; (4 filas) Duración: 228,699 ms For privacy reasons, i just deleted the result and the function name, but the resulst are obviously exactly the same, and the ().* form (which i needed) is taking so much more...there is a reason why? A workaround? Thanks! Gerardo
Hello If you use a record expansion over function's result, then function is called once for record's field. so don't do it on slow functions. Regards Pavel 2011/2/3 Gerardo Herzig <gherzig@fmed.uba.ar>: > Hi all, im using a function of my own in a subquery, and when wonderig > about the slowliness of this one, y relalize that: > > test=# SELECT (_xxfunction(854,'711H',11,false)).* ; > (4 filas) > --Result DELETED > Duración: 1069,465 ms > > > glyms=# SELECT * from _xxfunction(854,'711H',11,false) ; > (4 filas) > Duración: 228,699 ms > > For privacy reasons, i just deleted the result and the function name, > but the resulst are obviously exactly the same, and the ().* form (which > i needed) is taking so much more...there is a reason why? A workaround? > > Thanks! > > Gerardo > > > -- > Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-sql >
El jue, 03-02-2011 a las 20:47 +0100, Pavel Stehule escribió: > Hello > > If you use a record expansion over function's result, then function is > called once for record's field. > > so don't do it on slow functions. > > Regards > > Pavel > > > 2011/2/3 Gerardo Herzig <gherzig@fmed.uba.ar>: > > Hi all, im using a function of my own in a subquery, and when wonderig > > about the slowliness of this one, y relalize that: > > > > test=# SELECT (_xxfunction(854,'711H',11,false)).* ; > > (4 filas) > > --Result DELETED > > Duración: 1069,465 ms > > > > > > glyms=# SELECT * from _xxfunction(854,'711H',11,false) ; > > (4 filas) > > Duración: 228,699 ms > > > > For privacy reasons, i just deleted the result and the function name, > > but the resulst are obviously exactly the same, and the ().* form (which > > i needed) is taking so much more...there is a reason why? A workaround? > > > > Thanks! > > > > Gerardo > > > > > > -- > > Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) > > To make changes to your subscription: > > http://www.postgresql.org/mailpref/pgsql-sql > > > Mmmmm ok Thanks...So there is no workaround/alternative to this? Gerardo
>> > > Mmmmm ok Thanks...So there is no workaround/alternative to this? > yes, (SELECT x.* from func(...) x) instead SELECT (func(...)).* regards Pavel Stehule > Gerardo > >
El vie, 04-02-2011 a las 12:17 +0100, Pavel Stehule escribió: > >> > > > > Mmmmm ok Thanks...So there is no workaround/alternative to this? > > > > yes, (SELECT x.* from func(...) x) instead SELECT (func(...)).* > > regards > > Pavel Stehule > > > Gerardo > > > > > Great, i will check that. Thanks again Pavel! Gerardo