sql = sql.where(or_(t.c.category_id.in_(cats),t.c.category_level1.in_(cats),t.c.category_level2.in_(cats)))
p_1 = product_category.alias('p_1')
p_2 = product_category.alias('p_2')
p_3 = product_category.alias('p_3')
sql = select([(p_3.c.id).label('id'),(p_1.c.name).label('p1_name'),(p_2.c.name).label('p2_name'),(p_3.c.name).label('p3_name'),(p_3.c.keywords).label('keywords'),(p_3.c.operator).label('operator')]).where(and_(p_3.c.parent_id == p_2.c.id,p_2.c.parent_id == p_1.c.id,p_1.c.id != 0))