Database: yelp
Question: How many people reviewed restaurant " Vintner Grill " in 2010 ?
SQL:
SELECT COUNT ( DISTINCT t4.name ) FROM category AS t2 JOIN business AS t1 ON t2.business_id  =  t1.business_id JOIN review AS t3 ON t3.business_id  =  t1.business_id JOIN USER AS t4 ON t4.user_id  =  t3.user_id WHERE t1.name  =  "Vintner Grill" AND t2.category_name  =  "category_category_name0" AND t3.year  =  2010;