@Override
protected BasicIndexScan getIndex(
final LeafNodePlan plan,
final BasicIndexScan indexScan,
final Collection<Variable> sortCriterium,
final Map<Variable, Literal> minima,
final Map<Variable, Literal> maxima) {
BasicIndexScan index1 =
new MemoryIndexScan(
(OperatorIDTuple) null,
plan.getTriplePatterns(),
indexScan.getGraphConstraint(),
indexScan.getRoot());
index1.setIntersectionVariables(plan.getVariables());
index1.setUnionVariables(plan.getVariables());
return index1;
}
@Override
protected BasicOperator generateJoin(
final InnerNodePlan inp,
final Root root,
final BasicOperator left,
final BasicOperator right,
final Collection<Variable> sortCriterium,
final Map<TriplePattern, Map<Variable, VarBucket>> selectivity) {
// left-deep-tree or right-deep-tree?
if (left instanceof BasicIndexScan && right instanceof BasicIndexScan) {
if (((BasicIndexScan) right).getTriplePattern().size() == 1
|| ((BasicIndexScan) left).getTriplePattern().size() == 1) {
final Collection<TriplePattern> ctp;
if (inp.getLeft().getCost() < inp.getRight().getCost()) {
ctp = ((BasicIndexScan) left).getTriplePattern();
ctp.addAll(((BasicIndexScan) right).getTriplePattern());
} else {
ctp = ((BasicIndexScan) right).getTriplePattern();
ctp.addAll(((BasicIndexScan) left).getTriplePattern());
}
((BasicIndexScan) left).setTriplePatterns(ctp);
root.remove((BasicIndexScan) right);
return left;
}
}
Join join = new Join();
join.setEstimatedCardinality(inp.getCardinality());
// TODO check if necessary (or is it just necessary for RDF3X???)!
if (!(inp.getLeft() instanceof InnerNodePlan
&& ((InnerNodePlan) inp.getLeft()).getJoinType() == JoinType.DEFAULT)
&& (inp.getRight() instanceof InnerNodePlan
&& ((InnerNodePlan) inp.getRight()).getJoinType() == JoinType.DEFAULT)
|| (inp.getLeft() instanceof LeafNodePlan && inp.getRight() instanceof InnerNodePlan)) {
moveToLeft(inp.getRight().getTriplePatterns(), root);
} else if (!(inp.getRight() instanceof InnerNodePlan
&& ((InnerNodePlan) inp.getRight()).getJoinType() == JoinType.DEFAULT)
&& (inp.getLeft() instanceof InnerNodePlan
&& ((InnerNodePlan) inp.getLeft()).getJoinType() == JoinType.DEFAULT)
|| (inp.getRight() instanceof LeafNodePlan && inp.getLeft() instanceof InnerNodePlan)) {
moveToLeft(inp.getLeft().getTriplePatterns(), root);
} else if (inp.getLeft().getCost() > inp.getRight().getCost()) {
System.out.println(
"Card. of joins with estimated lower cost vs. est. higher cost:"
+ inp.getRight().getCardinality()
+ "<->"
+ inp.getLeft().getCardinality());
System.out.println(
"Cost of joins with estimated lower cost vs. est. higher cost:"
+ inp.getRight().getCost()
+ "<->"
+ inp.getLeft().getCost());
moveToLeft(inp.getRight().getTriplePatterns(), root);
} else {
System.out.println(
"Card. of joins with estimated lower cost vs. est. higher cost:"
+ inp.getLeft().getCardinality()
+ "<->"
+ inp.getRight().getCardinality());
System.out.println(
"Cost of joins with estimated lower cost vs. est. higher cost:"
+ inp.getLeft().getCost()
+ "<->"
+ inp.getRight().getCost());
moveToLeft(inp.getLeft().getTriplePatterns(), root);
}
join.setIntersectionVariables(inp.getJoinPartner());
join.setUnionVariables(inp.getVariables());
left.setSucceedingOperator(new OperatorIDTuple(join, 0));
right.setSucceedingOperator(new OperatorIDTuple(join, 1));
join.addPrecedingOperator(left);
join.addPrecedingOperator(right);
return join;
}