user: Question: what is the original channel when the note is Co-star in year 2012?
Columns: ['Year', 'Title', 'Original channel', 'Role', 'Note']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2003.0, 'Yankee Bokou ni Kaeru', 'TBS', 'Noriyuki Takahashi', 'Co-star']
SQL:

assistant: SELECT "Original channel" FROM "Table" WHERE "Note" = 'Co-star' AND "Year" = 2012.0;