querydsl using parent query entitypath in subquery - subquery

Question

I am trying to represent the following query in querydsl:
select a1.agreement_id, ad1.agreement_detail_id
from agreement a1
inner join agreement_details ad1 on a1.agreement_id=ad1.agreement_id
where ad1.transaction_id in (
select max(ad2.transaction_id)
from agreement_details ad2
inner join agreement a2 on ad2.agreement_id=a2.agreement_id
where
ad2.transaction_id<=1234
and a2.agreement_id=a1.agreement_id
and a2.entity_split_id=5678
)
order by a1.agreement_id asc
However, I'm having trouble getting querydsl to use a table from the parent query in the where clause of the subquery. For example, if I write code like the following:
QAgreement a1 = QAgreement.agreement;
QAgreementDetails ad1 = QAgreementDetails.agreementDetails;
QAgreement a2 = QAgreement.agreement;
QAgreementDetails ad2 = QAgreementDetails.agreementDetails;
HibernateQuery query = getHibernateQuery();
query.from(a1)
.innerJoin(a1.agreementDetailsesByAgreementId, ad1)
.fetch()
.where(ad1.transactionId.in(
new JPASubQuery().from(ad2)
.innerJoin(ad2.agreementByAgreementId, a2)
.where(ad2.transactionId.loe(maxTransactionId))
.where(a1.agreementId.eq(a2.agreementId))
.where(a2.entitySplitByEntitySplitId.entitySplitId.eq(entitySplitId))
.list(ad2.transactionId.max())))
.orderBy(a1.agreementId.asc());
and execute it, the resulting SQL looks like
select -- Some columns removed for brevity
agreement0_.agreement_id as agreemen1_0_0_,
agreementd1_.agreement_detail_id as agreemen1_11_1_
from
agreement agreement0_
inner join
agreement_details agreementd1_
on agreement0_.agreement_id=agreementd1_.agreement_id
where
agreementd1_.transaction_id in (
select
max(agreementd2_.transaction_id)
from
agreement_details agreementd2_
inner join
agreement agreement3_
on agreementd2_.agreement_id=agreement3_.agreement_id
where
agreementd2_.transaction_id<=1234
and agreement3_.agreement_id=agreement3_.agreement_id
and agreement3_.entity_split_id=5678
)
order by
agreement0_.agreement_id asc
You can see that the alias of the Agreement EntityPath a1 is not being used in the subquery and is being replaced by the alias of the Agreement EntityPath a2. Is there something else I have to do in querydsl to be able to produce this query?

Answer 1

The problem is that you don't use unique variables
QAgreement a1 = QAgreement.agreement;
QAgreementDetails ad1 = QAgreementDetails.agreementDetails;
QAgreement a2 = QAgreement.agreement;
QAgreementDetails ad2 = QAgreementDetails.agreementDetails;
In this case a1 and a2 as well as ad1 and ad2 refer to the same path.
The variable names in the Java code don't matter, you need to use them for example like this
QAgreement a1 = new QAgreement("a1");
QAgreementDetails ad1 = new QAgreementDetails("ad1");
QAgreement a2 = new QAgreement("a2");
QAgreementDetails ad2 = new QAgreementDetails("ad2");