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_12321870_32 ( player_name VARCHAR, period VARCHAR )

### Question ###
What is the name of the player who played in 2009 only?

### Accurate SQL ###

SELECT player_name FROM table_12321870_32 WHERE period = "2009"