user: Question: Who made highest assists when high rebounds was Al Horford (17)
Columns: ['Game', 'Date', 'Team', 'Score', 'High points', 'High rebounds', 'High assists', 'Location Attendance', 'Record']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [2.0, 'November 1', 'Philadelphia', 'W 95–88 (OT)', 'Joe Johnson (35)', 'Josh Smith (11)', 'Joe Johnson (5)', 'Philips Arena 19,651', '2–0']
SQL:

assistant: SELECT "High assists" FROM "Table" WHERE "High rebounds" = 'Al Horford (17)';