@Override
    public long fetchCount() {
        return queryEngine.count(queryMixin.getMetadata(), iterables);
    }
{@code AbstractCollQuery} provides a base class for {@code Collection} query implementations.

@param <T> result type
@param <Q> concrete subtype

@see CollQuery
@author tiwe
querydsl-collections/src/main/java/com/querydsl/collections/AbstractCollQuery.java