/**
* Creates a new count query for the given {@link Specification}.
*
* @param spec can be {@literal null}.
* @return
*/
private TypedQuery<Long> getCountQuery(Specification<M> spec) {
CriteriaBuilder builder = em.getCriteriaBuilder();
CriteriaQuery<Long> query = builder.createQuery(Long.class);
Root<M> root = applySpecificationToCriteria(spec, query);
if (query.isDistinct()) {
query.select(builder.countDistinct(root));
} else {
query.select(builder.count(root));
}
TypedQuery<Long> q = em.createQuery(query);
repositoryHelper.applyEnableQueryCache(q);
return q;
}
