Question

In spring-date-jpa, when my specification contains query.distinct(true) i see that the count(Specification) method, the count query is incorrect.
The generated SQL looks like this :

select distinctcount(*) …

Instead of

select count(distinct(*)) …

In that post:spring-source-forum
The workaround was to mofify the source code of spring-data-jpa.

Is there any other solution?

Answer 1

I have found another workaround:

Subquery<Class1> sq = query.subquery(Class1.class);
Root<Class1> spouseEmp = sq.from(Class1.class);
sq.select(spouseEmp);
sq.where(builder.equal(spouseEmp.get("class2"),class2.get("class2")));
predicate.getExpressions().add(builder.exists(sq));