user: Question: How many districts does Ed Jones represent?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Tennessee 4', 'Joe L. Evins', 'Democratic', 1946.0, 'Re-elected', 'Joe L. Evins (D) 82.6% J. D. Boles (R) 17.4%']
SQL:

assistant: SELECT COUNT("District") FROM "Table" WHERE "Incumbent" = 'Ed Jones';