Who directed the episode that had 0.57 million U.S. viewers? 
CREATE TABLE table_26914076_4 (directed_by VARCHAR, us_viewers__millions_ VARCHAR)
SELECT directed_by FROM table_26914076_4 WHERE us_viewers__millions_ = "0.57"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_26914076_4 (directed_by VARCHAR, us_viewers__millions_ VARCHAR) Question: Who directed the episode that had 0.57 million U.S. viewers?  [/INST] SELECT directed_by FROM table_26914076_4 WHERE us_viewers__millions_ = "0.57" </s>