@Override
    protected void serializeConstant(int parameterIndex, String constantLabel) {
        append("?");
        append(Integer.toString(parameterIndex));
    }
{@code NativeSQLSerializer} extends {@link SQLSerializer} to extract referenced entity paths and change
some serialization formats

@author tiwe
querydsl-jpa/src/main/java/com/querydsl/jpa/NativeSQLSerializer.java