private void advance(boolean lhs) throws SQLException { if (lhs) { lhsTuple = nextLhsTuple; lhsKey.set(nextLhsKey); if (lhsTuple != null) { nextLhsTuple = lhsIterator.next(); if (nextLhsTuple != null) { nextLhsKey.evaluate(nextLhsTuple); } else { nextLhsKey.clear(); } } } else { rhsTuple = nextRhsTuple; rhsKey.set(nextRhsKey); if (rhsTuple != null) { nextRhsTuple = rhsIterator.next(); if (nextRhsTuple != null) { nextRhsKey.evaluate(nextRhsTuple); } else { nextRhsKey.clear(); } } } }
private void init() throws SQLException { nextLhsTuple = lhsIterator.next(); if (nextLhsTuple != null) { nextLhsKey.evaluate(nextLhsTuple); } advance(true); nextRhsTuple = rhsIterator.next(); if (nextRhsTuple != null) { nextRhsKey.evaluate(nextRhsTuple); } advance(false); initialized = true; }