This has been fixed in 4.0 (Git master branch). I just committed corresponding 
pull request:

https://github.com/apache/cayenne/pull/136
https://issues.apache.org/jira/browse/CAY-2141 

Thanks,
Andrus

> On Nov 15, 2016, at 9:43 AM, Andrus Adamchik <and...@objectstyle.org> wrote:
> 
> Could be a bug. I just opened a Jira [1] to investigate. From what I am 
> seeing the current behavior is correct in respect to the returned result, but 
> is certainly suboptimal.
> 
> Andrus
> 
> [1] https://issues.apache.org/jira/browse/CAY-2141
> 
>> On Nov 14, 2016, at 11:25 PM, Mark Stobbe <markstobb...@gmail.com> wrote:
>> 
>> Hi Andrus,
>> 
>> Version 3.2M1. Relationship would be a normal to-one yes. I am executing a
>> query for the first 25 records of "djem_user".
>> Configuration is the following:
>> 
>> <db-entity name="djem_account">
>> <db-attribute name="id" type="BIGINT" isMandatory="true"
>> isPrimaryKey="true" />
>> </db-entity>
>> 
>> <db-entity name="djem_user">
>> <db-attribute name="id" type="BIGINT" isMandatory="true"
>> isPrimaryKey="true" />
>> <db-attribute name="fk_acco" type="BIGINT" />
>> </db-entity>
>> 
>> <db-relationship name="user_acco" source="djem_user" target="djem_account"
>> toMany="false">
>> <db-attribute-pair source="fk_acco" target="id" />
>> </db-relationship>
>> 
>> <db-relationship name="acco_user" source="djem_account" target="djem_user"
>> toMany="true">
>> <db-attribute-pair source="id" target="fk_acco" />
>> </db-relationship>
>> 
>> Mark
>> 
>> On Mon, Nov 14, 2016 at 6:17 PM, Andrus Adamchik <and...@objectstyle.org>
>> wrote:
>> 
>>> Hi Mark,
>>> 
>>> Yeah, doesn't look right. What version of Cayenne is this? And what is the
>>> relationship semantics? Is this a regular to-one?
>>> 
>>> Andrus
>>> 
>>>> On Nov 14, 2016, at 6:02 PM, Mark Stobbe <markstobb...@gmail.com> wrote:
>>>> 
>>>> Hi,
>>>> 
>>>> I was wondering if this is correct:
>>>> 
>>>> I am using an fetch limit for some queries, though I also need to make
>>> sure
>>>> I add the prefetch rules to refresh the data. I read in the documentation
>>>> that i should use DISJOINT_BY_ID_PREFETCH_SEMANTICS, so I did. Now when
>>> I
>>>> look at the queries I am a little bit surprised because I see the same id
>>>> occur many times. Shouldn't this be purged before building the query?
>>>> 
>>>> Example query would be:
>>>> 
>>>> SELECT t0.*
>>>> FROM   djem_account t0
>>>> WHERE  ( t0.id = 217 )
>>>>      OR ( t0.id = 217 )
>>>>      OR ( t0.id = 217 )
>>>>      OR ( t0.id = 217 )
>>>>      OR ( t0.id = 217 )
>>>>      OR ( t0.id = 217 )
>>>>      OR ( t0.id = 217 )
>>>>      OR ( t0.id = 217 )
>>>>      OR ( t0.id = 217 )
>>>>      OR ( t0.id = 217 )
>>>>      OR ( t0.id = 217 )
>>>>      OR ( t0.id = 217 )
>>>>      OR ( t0.id = 217 )
>>>>      OR ( t0.id = 219 )
>>>>      OR ( t0.id = 219 )
>>>>      OR ( t0.id = 219 )
>>>>      OR ( t0.id = 219 )
>>>>      OR ( t0.id = 219 )
>>>>      OR ( t0.id = 219 )
>>>>      OR ( t0.id = 219 )
>>>>      OR ( t0.id = 219 )
>>>>      OR ( t0.id = 219 )
>>>>      OR ( t0.id = 219 )
>>>>      OR ( t0.id = 219 )
>>>>      OR ( t0.id = 219 );
>>>> 
>>>> Best regards,
>>>> Mark Stobbe
>>> 
>>> 
> 

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