public Expression<? extends D> getEq() {
            return eq;
        }
{@code CaseForEqBuilder} enables the construction of typesafe case-when-then-else constructs
for equals-operations :
e.g.

<pre>{@code
QCustomer c = QCustomer.customer;
Expression<Integer> cases = c.annualSpending
    .when(1000l).then(1)
    .when(2000l).then(2)
    .when(5000l).then(3)
    .otherwise(4);
}</pre>

@author tiwe

@param <D>
querydsl-core/src/main/java/com/querydsl/core/types/dsl/CaseForEqBuilder.java