On Friday 28 September 2007 01:14:32 Michael Bayer wrote: > On Sep 27, 2007, at 3:53 PM, [EMAIL PROTECTED] wrote: > > i know in 0.4 one can request a polymorphic request to be > > automaticaly split into multiple per-subtype requests. i've no > > idea how this compares +/- to the huge union/outerjoin that gives > > all in one long shot. > > > > my question is.. can this mechanism/approach be used somehow for > > (semi) automatic "vertical" loading, i.e. instead of loading all > > items in all rows, load only some items normaly while > > (pre)loading some specific columns in whole in one separate shot? > > say there is a table X having a,b,c..p,q. So i do a plain row > > query over X, getting a,b,c,d per row, and request the p and q > > columns (pre)loaded whole (or partial as per some limit). > > i imagine this to be useful to avoid zillions of eagerloads/joins > > etc (when the columns in question are links to somewhere). > > but i might be wrong... - i've no idea how the eagerloading > > scales. Any arguments pro/con? > > if youre talking about just one table X, "deferred" columns will > hold off the loading of those columns until they are accessed. as > far as the joined tables, polymorphic_fetch="deferred" will leave > those to be loaded when those attributes are first accessed. > that's as well as I understand your question so far.... mmm no, i'm not asking that. is there any available mechanism to load a query by columns instead of by rows. that is split a query verticaly. like paginate verticaly and not just horizontaly. Think a table with rows and many columns. usualy query yields full rows. i want to split the query into several, each having a number (>=1) of columns of the whole thing, all under same filtering, one being the leading one, others loaded per request, in big chunks). nevermind, it won't be hard to make anyway, once i know exacty what i need....
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