user: Question: Wat was the result for the 20 km after 2008 when the venue was Metz, France?
Columns: ['Year', 'Tournament', 'Venue', 'Result', 'Event']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2001.0, 'World Youth Championships', 'Debrecen , Hungary', '10th', '5000 m']
SQL:

assistant: SELECT "Result" FROM "Table" WHERE "Year" > 2008.0 AND "Event" = '20 km' AND "Venue" = 'Metz, France';