Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_28171 ( "No." real, "Title" text, "Directed by" text, "Written by" text, "Original air date" text, "Production code" text, "U.S. viewers (million)" text )

### Question ###
Who directed the episode that had a production code of 2j5457?

### Accurate SQL ###

SELECT "Directed by" FROM table_28171 WHERE "Production code" = '2J5457'