* @param index the rank of the string column (0 is the first)
*
* @return the nth string column
*/
public static StringColumn getStringColumn(Table t, int index) {
StringColumn ret = null;
for (int i = 0; i < t.getColumnCount(); i++) {
ret = StringColumn.getColumn(t, i);
if (ret != null && !ret.isInternal() && index-- == 0)
return ret;
}
return null;
}