message: Fixed a bug in Table.window
diff: @@ -105,7 +105,7 @@ namespace Table {
  if (start === 0 && end === table._rowCount) return table;
  const ret = Object.create(null);
  const columns = Object.keys(schema);
  - ret._rowCount = view.length;
  + ret._rowCount = end - start;
  ret._columns = columns;
  ret._schema = schema;
  for (const k of columns) {
  