Method Join

src/java/simpledb/execution/Join.java:36–45

Constructor. Accepts two children to join and the predicate to join them on @param p The predicate to use to join the children @param child1 Iterator for the left(outer) relation to join @param child2 Iterator for the right(inner) relation to join

(JoinPredicate p, OpIterator child1, OpIterator child2)

     *            Iterator for the right(inner) relation to join
     */
    public Join(JoinPredicate p, OpIterator child1, OpIterator child2) {
        // some code goes here
        this.joinPredicate = p;
        this.child1 = child1;
        this.child2 = child2;
        this.tupleDesc = TupleDesc.merge(child1.getTupleDesc(),child2.getTupleDesc());
//        if(p.getOperator().equals(Predicate.Op.EQUALS)){
//            hashEquiJoin = new HashEquiJoin(p,child1,child2);
//        }
    }

    public JoinPredicate getJoinPredicate() {
        // some code goes here