@Override
public PhysicalOperator visitJoin(Join join, Object value) throws OptimizerException {
PhysicalOperator leftOp = join.getLeft().accept(this, value);
List<OrderDef> leftOrderDefs = Lists.newArrayList();
for (JoinCondition jc : join.getConditions()) {
leftOrderDefs.add(new OrderDef(Direction.ASC, jc.getLeft()));
}
leftOp = new Sort(leftOp, leftOrderDefs, false);
leftOp = new SelectionVectorRemover(leftOp);
PhysicalOperator rightOp = join.getRight().accept(this, value);
List<OrderDef> rightOrderDefs = Lists.newArrayList();
for (JoinCondition jc : join.getConditions()) {
rightOrderDefs.add(new OrderDef(Direction.ASC, jc.getRight()));
}
rightOp = new Sort(rightOp, rightOrderDefs, false);
rightOp = new SelectionVectorRemover(rightOp);
MergeJoinPOP mjp =
new MergeJoinPOP(
leftOp, rightOp, Arrays.asList(join.getConditions()), join.getJointType());
return new SelectionVectorRemover(mjp);
}
Table resolveTable(int index) {
int numTables = -1;
for (int i = 0; i < getTableCount(); i++) {
Object table = getTable(i);
if (table instanceof Table) {
numTables++;
if (numTables == index) return (Table) table;
} else if (table instanceof Join) {
Object o = table;
while (o instanceof Join) {
Join join = (Join) o;
o = join.getLeft();
if (o instanceof Table) {
numTables++;
if (numTables == index) return (Table) o;
o = join.getRight();
}
}
numTables++;
if (numTables == index) return (Table) o;
} else throw new RuntimeException("unknown table type");
}
throw new RuntimeException("can't resolve table");
}