docs: public int[] boundParamIndexes() {
          if (getParameters().length == 0) {
              return null;
          }
  
          BitSet ints = new BitSet();
          ArrayList<AbstractPlanNode> ixscans = rootPlanGraph.findAllNodesOfType(PlanNodeType.INDEXSCAN);
          if (subPlanGraph != null) {
              ixscans.addAll(subPlanGraph.findAllNodesOfType(PlanNodeType.INDEXSCAN));
          }
          for (AbstractPlanNode apn : ixscans) {
              assert(apn instanceof IndexScanPlanNode);
              IndexScanPlanNode ixs = (IndexScanPlanNode) apn;
              setParamIndexes(ints, ixs.getBindings());
          }
  
          ArrayList<AbstractPlanNode> ixcounts = rootPlanGraph.findAllNodesOfType(PlanNodeType.INDEXCOUNT);
          if (subPlanGraph != null) {
              ixcounts.addAll(subPlanGraph.findAllNodesOfType(PlanNodeType.INDEXCOUNT));
          }
          for (AbstractPlanNode apn : ixcounts) {
              assert(apn instanceof IndexCountPlanNode);
              IndexCountPlanNode ixc = (IndexCountPlanNode) apn;
              setParamIndexes(ints, ixc.getBindings());
          }
          return bitSetToIntVector(ints);
      }