docs: private String catalogCond(String columnName, String catalog) {
      if (catalog == null) {
        /* Treat null catalog as current */
        if (connection.nullCatalogMeansCurrent) {
          return "(ISNULL(database()) OR (" + columnName + " = database()))";
        }
        return "(1 = 1)";
      }
      if (catalog.isEmpty()) {
        return "(ISNULL(database()) OR (" + columnName + " = database()))";
      }
      return "(" + columnName + " = " + escapeQuote(catalog) + ")";
  
    }