sumMap

Syntax: sumMap(key, value) or sumMap(Tuple(key, value))

Totals the value array according to the keys specified in the key array.

Passing tuple of keys and values arrays is a synonym to passing two arrays of keys and values.

The number of elements in key and value must be the same for each row that is totaled.

Returns a tuple of two arrays: keys in sorted order, and values ​​summed for the corresponding keys.

Example:

  1. CREATE TABLE sum_map(
  2.     date Date,
  3.     timeslot DateTime,
  4.     statusMap Nested(
  5.         status UInt16,
  6.         requests UInt64
  7.     ),
  8.     statusMapTuple Tuple(Array(Int32), Array(Int32))
  9. ) ENGINE = Log;
  10. INSERT INTO sum_map VALUES
  11.     ('2000-01-01', '2000-01-01 00:00:00', [1, 2, 3], [10, 10, 10], ([1, 2, 3], [10, 10, 10])),
  12.     ('2000-01-01', '2000-01-01 00:00:00', [3, 4, 5], [10, 10, 10], ([3, 4, 5], [10, 10, 10])),
  13.     ('2000-01-01', '2000-01-01 00:01:00', [4, 5, 6], [10, 10, 10], ([4, 5, 6], [10, 10, 10])),
  14.     ('2000-01-01', '2000-01-01 00:01:00', [6, 7, 8], [10, 10, 10], ([6, 7, 8], [10, 10, 10]));
  16. SELECT
  17.     timeslot,
  18.     sumMap(statusMap.status, statusMap.requests),
  19.     sumMap(statusMapTuple)
  20. FROM sum_map
  21. GROUP BY timeslot
  1. ┌────────────timeslot─┬─sumMap(statusMap.status, statusMap.requests)─┬─sumMap(statusMapTuple)─────────┐
  2. │ 2000-01-01 00:00:00 │ ([1,2,3,4,5],[10,10,20,10,10])               │ ([1,2,3,4,5],[10,10,20,10,10]) │
  3. │ 2000-01-01 00:01:00 │ ([4,5,6,7,8],[10,10,20,10,10])               │ ([4,5,6,7,8],[10,10,20,10,10]) │
  4. └─────────────────────┴──────────────────────────────────────────────┴────────────────────────────────┘