#include <iostream>
#include "Relation.h"

using namespace std;

//currently only implementing for comparison
Relation equality(string attName, string s, Relation r){
	Attribute att = r.getAttributeByName(attName);
	vector<Attribute> r_atts = r.getAttributes();
	vector<Attribute> new_atts = r_atts;

	for (int i = 0; i < new_atts.size(); ++i) {
		new_atts[i].clearAllValues();
	}	

	for (int i = 0; i < att.getSize(); ++i) {
		if (att[i] == s){
			for (int j = 0; j < r_atts.size(); ++j){
				new_atts[j].addCell(r_atts[j][i]);
			}
		}
	}

	//currently all returned relations are called TEMP
	Relation new_r("TEMP", new_atts);
	return new_r;
}
/*
vector<Attribute> equality(Attribute a, int i){
	for (int i = 0; i < a.getSize(); ++i) {
		//
	}	
}

vector<Attribute> gt(Attribute a, int i){
	for (int i = 0; i < a.getSize(); ++i) {
		//
	}	
}

vector<Attribute> lt(Attribute a, int i){
	for (int i = 0; i < a.getSize(); ++i) {
		//
	}	
}

vector<Attribute> gte(Attribute a, int i){
	for (int i = 0; i < a.getSize(); ++i) {
		//
	}	
}

vector<Attribute> lte(Attribute a, int i){
	for (int i = 0; i < a.getSize(); ++i) {
		//
	}	
}
*/