Method fetchNext

src/java/simpledb/execution/HashEquiJoin.java:133–159

()

    }

    protected Tuple fetchNext() throws TransactionAbortedException, DbException {
        if (listIt != null && listIt.hasNext()) {
            return processList();
        }

        // loop around child2
        while (child2.hasNext()) {
            t2 = child2.next();

            // if match, create a combined tuple and fill it with the values
            // from both tuples
            List<Tuple> l = map.get(t2.getField(pred.getField2()));
            if (l == null)
                continue;
            listIt = l.iterator();

            return processList();
        }

        // child2 is done: advance child1
        child2.rewind();
        if (loadMap()) {
            return fetchNext();
        }

        return null;
    }

    @Override
    public OpIterator[] getChildren() {