docs: private void harmonizeCommonTableSchemas(CompiledPlan plan) {
          List<AbstractPlanNode> seqScanNodes = plan.rootPlanGraph.findAllNodesOfClass(SeqScanPlanNode.class);
          for (AbstractPlanNode planNode : seqScanNodes) {
              SeqScanPlanNode seqScanNode = (SeqScanPlanNode)planNode;
              StmtCommonTableScan scan = seqScanNode.getCommonTableScan();
              if (scan != null) {
                  scan.harmonizeOutputSchema();
              }
          }
      }