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;
}
