code: public static <T> List<T> queryColumn(
        String sql, String columnName, Class<T> columnType, Object[] params) throws YankSQLException {
  
      return queryColumn(YankPoolManager.DEFAULT_POOL_NAME, sql, columnName, columnType, params);
    }
docs: Return a List of Objects from a single table column given an SQL statement using the default
  connection pool.
  
  @param <T>
  @param sql The SQL statement
  @param params The replacement parameters
  @param columnType The Class of the desired return Objects matching the table
  @return The Column as a List