When was the last time Mary Crainie published a paper ?
SELECT DISTINCT MAX ( t3.year ) FROM writes AS t2 JOIN author AS t1 ON t2.authorid  =  t1.authorid JOIN paper AS t3 ON t2.paperid  =  t3.paperid WHERE t1.authorname  =  "Mary Crainie";
SELECT DISTINCT MAX ( t3.year ) FROM writes AS t2 JOIN author AS t1 ON t2.authorid  =  t1.authorid JOIN paper AS t3 ON t2.paperid  =  t3.paperid WHERE t1.authorname  =  "Mary Crainie";
[{'MAX ( t3.year )': None}]