CREATE TABLE table_32622 ("Stage" TEXT, "Date" TEXT, "Route" TEXT, "Terrain" TEXT, "Length" TEXT, "Winner" TEXT)

Which stage took the tour through Boulogne-Billancourt?
SELECT "Stage" FROM table_32622 WHERE "Route" = 'boulogne-billancourt'
SELECT "Stage" FROM "table_32622" WHERE "Route" = 'boulogne-billancourt'