What is average salary of the players in the team named 'Boston Red Stockings' ?
SELECT avg(T1.salary) FROM salary AS T1 JOIN team AS T2 ON T1.team_id  =  T2.team_id_br WHERE T2.name  = 'Boston Red Stockings'
SELECT avg(T1.salary) FROM salary AS T1 JOIN team AS T2 ON T1.team_id  =  T2.team_id_br WHERE T2.name  = 'Boston Red Stockings'
[{'avg(T1.salary)': 2856616.7595628416}]