[hibernate-dev] Query#iterate

[Steve Ebersole]

https://hibernate.atlassian.net/browse/HHH-11443

On Sat, Jan 28, 2017 at 6:38 PM andrea boriero <andrea at hibernate.org> wrote:

> +1 to remove
>
> On 28 Jan 2017 20:44, "Chris Cranford" <chris at hibernate.org> wrote:
>
> > +1 to remove as well
> >
> >
> > On 01/27/2017 01:50 PM, Sanne Grinovero wrote:
> > > +1 to remove
> > >
> > > On 27 January 2017 at 18:34, Vlad Mihalcea <mihalcea.vlad at gmail.com>
> > wrote:
> > >> I'm for removing it even if it didn't complicate the query parser.
> > >>
> > >> Vlad
> > >>
> > >> On Fri, Jan 27, 2017 at 8:26 PM, Steve Ebersole <steve at hibernate.org>
> > wrote:
> > >>
> > >>> Because the behavior is also fundamentally questionable.
> > >>>
> > >>> On Fri, Jan 27, 2017 at 12:17 PM Christian Beikov <
> > >>> christian.beikov at gmail.com> wrote:
> > >>>
> > >>>> I'm sorry, I apparently confused iterate() with scroll() then, so
> > forget
> > >>>> what I wrote before ^^
> > >>>>
> > >>>> In face of that new info, I actually don't know of any actual users.
> > >>> After
> > >>>> thinking a bit about it, why not make that behavior configurable via
> > >>>> setProperty and drop that method?
> > >>>>
> > >>>>
> > >>>> Am 27.01.2017 um 19:01 schrieb Steve Ebersole:
> > >>>>
> > >>>> On Fri, Jan 27, 2017 at 9:51 AM Christian Beikov <
> > >>>> christian.beikov at gmail.com> wrote:
> > >>>>
> > >>>> I just know of people that are using iterate() now for efficient
> > >>>> incremental processing, but I guess any other approach(streams
> maybe?)
> > >>>> to do incremental processing would be good enough for these users.
> > >>>>
> > >>>>
> > >>>> ScrollableResults do not meet that need?
> > >>>>
> > >>>>
> > >>>>
> > >>>> Unfortunately I don't know what a shallow query is or what the
> > >>>> implication on the query or the processing of being shallow are.
> > >>>>
> > >>>>
> > >>>> Just what I said before.  "shallow" is simply a boolean flag that is
> > part
> > >>>> of the translator.  It is set to true when the translation is
> > triggered
> > >>>> from Query#iterate.  When the translation is triggered from
> > Query#list or
> > >>>> Query#scroll it is set to false.
> > >>>>
> > >>>>
> > >>>>
> > >>>> I guess this has to do with how row processing is done?
> > >>>>
> > >>>>
> > >>>> The main thing is effects is the SQL we render.  For "entity
> returns"
> > it
> > >>>> simply selects the ids and we expect to then load them
> (immediately!)
> > by
> > >>>> that id (N+1).  Its usefulness is actually VERY limited in scope as
> it
> > >>>> actually performs horrendously in, what, 95-99% of use cases?
> > >>>>
> > >>>> Interestingly it really does not have much effect on "row
> processing".
> > >>>>
> > >>>>
> > >>>>
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