Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_18254488_2 (position VARCHAR, player VARCHAR)
### Question:
When koki mizuno is the player how man positions are there?
### Answer:
SELECT COUNT(position) FROM table_18254488_2 WHERE player = "Koki Mizuno"