user: Question: Cordell Hull is the incumbent in how many districts?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Tennessee 2', 'J. Will Taylor', 'Republican', 1918.0, 'Re-elected', 'J. Will Taylor (R) 96.3% Mitchell Long (D) 3.7%']
SQL:

assistant: SELECT COUNT("District") FROM "Table" WHERE "Incumbent" = 'Cordell Hull';