groupArrayMovingSum

Introduced in: v20.1

Calculates the moving sum of input values.

The function can take the window size as a parameter. If left unspecified, the function takes the window size equal to the number of rows in the column.

Syntax

groupArrayMovingSum(numbers_for_summing)
groupArrayMovingSum(window_size)(numbers_for_summing)

Parameters

window_size — Size of the calculation window. If left unspecified, the function takes the window size equal to the number of rows in the column. UInt64

Arguments

numbers_for_summing — Expression resulting in a numeric data type value. (U)Int* or Float* or Decimal

Returned value

Returns an array of the same size and type as the input data. Array

Examples

Usage example

CREATE TABLE t
(
    `int` UInt8,
    `float` Float32,
    `dec` Decimal32(2)
)
ENGINE = Memory;

INSERT INTO t VALUES (1, 1.1, 1.10), (2, 2.2, 2.20), (4, 4.4, 4.40), (7, 7.77, 7.77);

SELECT
    groupArrayMovingSum(int) AS I,
    groupArrayMovingSum(float) AS F,
    groupArrayMovingSum(dec) AS D
FROM t;

┌─I──────────┬─F───────────────────────────────┬─D──────────────────────┐
│ [1,3,7,14] │ [1.1,3.3000002,7.7000003,15.47] │ [1.10,3.30,7.70,15.47] │
└────────────┴─────────────────────────────────┴────────────────────────┘

With window size

SELECT
    groupArrayMovingSum(2)(int) AS I,
    groupArrayMovingSum(2)(float) AS F,
    groupArrayMovingSum(2)(dec) AS D
FROM t;

┌─I──────────┬─F───────────────────────────────┬─D──────────────────────┐
│ [1,3,6,11] │ [1.1,3.3000002,6.6000004,12.17] │ [1.10,3.30,6.60,12.17] │
└────────────┴─────────────────────────────────┴────────────────────────┘

groupArrayMovingSum​

groupArrayMovingSum