public void calculateColumnWidths() {
		for (java.util.Map.Entry<Integer, TableHeader> headerEntry : headers.entrySet()) {
			final Integer headerEntryKey = headerEntry.getKey();
			for (TableRow tableRow : rows) {
				if (tableRow.getValue(headerEntryKey) != null) {
					headerEntry.getValue().updateWidth(tableRow.getValue(headerEntryKey).length());
				}
			}
		}
	}
Add a new empty row to the table.

@return the newly created row, which can be then be populated
spring-xd-shell/src/main/java/org/springframework/xd/shell/util/Table.java