When did restaurant John Schaller has its first inspection in 2010?
John Schaller refers to dba_name = 'JOHN SCHALLER'; first inspection refers to min(inspection_date); in 2010 refers to inspection_date like '2010%'
SELECT MIN(T2.inspection_date) FROM establishment AS T1 INNER JOIN inspection AS T2 ON T1.license_no = T2.license_no WHERE T1.dba_name = 'JOHN SCHALLER' AND strftime('%Y', T2.inspection_date) = '2010'