assert attr != null : "Unable to find field: " + fieldName;
addCondition(conditionName, cond, attr, op);
}
protected void addCondition(String conditionName, String cond, Attribute attr, Op op) {
Condition condition = new Condition(conditionName, /*(_conditions.size() + _additionals.size()) == 0 ? "" : */cond, attr, op);
_additionals.add(condition);
}