// partition rows 20, subs [3, 5, 8]
// partition rows 20, subs [9, 10]
{ "employee_id":24, "position_id":2, "sub":9, "salary":19 }
{ "employee_id":36, "position_id":2, "sub":10, "salary":20 }
{ "employee_id":11, "position_id":1, "sub":8, "salary":18 }
{ "employee_id":27, "position_id":2, "sub":9, "salary":19 }
{ "employee_id":23, "position_id":2, "sub":9, "salary":19 }
{ "employee_id":25, "position_id":2, "sub":9, "salary":19 }
{ "employee_id":8, "position_id":1, "sub":8, "salary":18 }
{ "employee_id":12, "position_id":1, "sub":8, "salary":18 }
{ "employee_id":29, "position_id":2, "sub":10, "salary":20 }
{ "employee_id":33, "position_id":2, "sub":10, "salary":20 }
{ "employee_id":19, "position_id":1, "sub":8, "salary":18 }
{ "employee_id":22, "position_id":2, "sub":9, "salary":19 }
{ "employee_id":31, "position_id":2, "sub":10, "salary":20 }
{ "employee_id":30, "position_id":2, "sub":10, "salary":20 }
{ "employee_id":35, "position_id":2, "sub":10, "salary":20 }
{ "employee_id":5, "position_id":1, "sub":5, "salary":15 }
{ "employee_id":4, "position_id":1, "sub":5, "salary":15 }
{ "employee_id":16, "position_id":1, "sub":8, "salary":18 }
{ "employee_id":13, "position_id":1, "sub":8, "salary":18 }
{ "employee_id":9, "position_id":1, "sub":8, "salary":18 }