user: Question: In what district was the incumbent Cordell Hull? 
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Tennessee 1', 'B. Carroll Reece', 'Republican', 1920.0, 'Re-elected', 'B. Carroll Reece (R) 78.6% W. I. Giles (D) 21.4%']
SQL:

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