docs: void resolveColumnIndexesUsingSchema(NodeSchema inputSchema) {
          // get all the TVEs in the output columns
          int difftor = 0;
          for (SchemaColumn col : m_outputSchema) {
              col.setDifferentiator(difftor);
              ++difftor;
              Collection<TupleValueExpression> allTves =
                      ExpressionUtil.getTupleValueExpressions(col.getExpression());
              // and update their indexes against the table schema
              for (TupleValueExpression tve : allTves) {
                  tve.setColumnIndexUsingSchema(inputSchema);
                  assert (tve.getColumnIndex() >= 0 && tve.getColumnIndex() < inputSchema.size());
              }
          }
          // DON'T RE-SORT HERE
      }