[hibernate-dev] Query#iterate

[Chris Cranford]

+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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