docs: private static void fixDistributedApproxCountDistinct(
              AggregatePlanNode distNode,
              AggregatePlanNode coordNode) {
  
          assert (distNode != null);
          assert (coordNode != null);
  
          // Patch up any APPROX_COUNT_DISTINCT on the distributed node.
          List<ExpressionType> distAggTypes = distNode.getAggregateTypes();
          boolean hasApproxCountDistinct = false;
          for (int i = 0; i < distAggTypes.size(); ++i) {
              ExpressionType et = distAggTypes.get(i);
              if (et == ExpressionType.AGGREGATE_APPROX_COUNT_DISTINCT) {
                  hasApproxCountDistinct = true;
                  distNode.updateAggregate(i, ExpressionType.AGGREGATE_VALS_TO_HYPERLOGLOG);
              }
          }
  
          if (hasApproxCountDistinct) {
              // Now, patch up any APPROX_COUNT_DISTINCT on the coordinating node.
              List<ExpressionType> coordAggTypes = coordNode.getAggregateTypes();
              for (int i = 0; i < coordAggTypes.size(); ++i) {
                  ExpressionType et = coordAggTypes.get(i);
                  if (et == ExpressionType.AGGREGATE_APPROX_COUNT_DISTINCT) {
                      coordNode.updateAggregate(i, ExpressionType.AGGREGATE_HYPERLOGLOGS_TO_CARD);
                  }
              }
          }
      }