docs: static void collectAllExpressions(HsqlList set, Expression e,
                                        OrderedIntHashSet typeSet,
                                        OrderedIntHashSet stopAtTypeSet) {
  
          if (e == null) {
              return;
          }
  
          if (stopAtTypeSet.contains(e.opType)) {
              return;
          }
  
          for (int i = 0; i < e.nodes.length; i++) {
              collectAllExpressions(set, e.nodes[i], typeSet, stopAtTypeSet);
          }
  
          if (typeSet.contains(e.opType)) {
              set.add(e);
          }
  
          if (e.subQuery != null && e.subQuery.queryExpression != null) {
              e.subQuery.queryExpression.collectAllExpressions(set, typeSet,
                      stopAtTypeSet);
          }
      }