private void buildHashTable(QueryIterator iter1) {
state = Phase.HASH;
for (; iter1.hasNext(); ) {
Binding row1 = iter1.next();
s_countProbe++;
hashTable.put(row1);
}
iter1.close();
state = Phase.STREAM;
}
protected Binding moveToNextBindingOrNull() {
// iterCurrent is the iterator of entries in the
// probe hashed table for the current stream row.
// iterStream is the stream of incoming rows.
switch (state) {
case DONE:
return null;
case HASH:
case INIT:
throw new IllegalStateException();
case TRAILER:
return doOneTail();
case STREAM:
}
for (; ; ) {
// Ensure we are processing a row.
while (iterCurrent == null) {
// Move on to the next row from the right.
if (!iterStream.hasNext()) {
state = Phase.TRAILER;
iterTail = joinFinished();
if (iterTail != null) return doOneTail();
return null;
}
rowStream = iterStream.next();
s_countScan++;
iterCurrent = hashTable.getCandidates(rowStream);
yielded = false;
}
// Emit one row using the rightRow and the current matched left rows.
if (!iterCurrent.hasNext()) {
iterCurrent = null;
if (!yielded) {
Binding b = noYieldedRows(rowStream);
if (b != null) {
s_countScan++;
return b;
}
}
continue;
}
// Nested loop join, only on less.
// Iterator<Binding> iter = nestedLoop(iterCurrent, rowStream) ;
Binding rowCurrentProbe = iterCurrent.next();
Binding r = Algebra.merge(rowCurrentProbe, rowStream);
Binding r2 = null;
if (r != null) r2 = yieldOneResult(rowCurrentProbe, rowStream, r);
if (r2 == null) {
// Reject
} else {
yielded = true;
s_countResults++;
return r2;
}
}
}