docs: private void copyTableSchemaFromShared() {
          for (SchemaColumn scol : m_sharedScan.getOutputSchema()) {
              SchemaColumn copy = new SchemaColumn(scol.getTableName(),
                                                   getTableAlias(),
                                                   scol.getColumnName(),
                                                   scol.getColumnAlias(),
                                                   scol.getExpression(),
                                                   scol.getDifferentiator());
              addOutputColumn(copy);
          }
      }