cascade._num_cols = fr.numCols();
cascade._col_names = fr.names();
cascade._string = null;
//TODO: colSummary cols = new Inspect2.ColSummary[num_cols];
} else if (env.isNum()) {
cascade._scalar = env.popDbl();
sb.append(Double.toString(cascade._scalar));
cascade._string = null;
} else if (env.isStr()) {
cascade._string = env.popStr();
sb.append(cascade._string);