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GROUP_ARRAY_MOVING_AVG

The GROUP_ARRAY_MOVING_AVG function calculates the moving average 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 input values.

Syntax

GROUP_ARRAY_MOVING_AVG(<expr>)

GROUP_ARRAY_MOVING_AVG(<window_size>)(<expr>)

Arguments

ArgumentsDescription
<window_size>Any numerical expression
<expr>Any numerical expression

Return Type

Returns an Array with elements of double or decimal depending on the source data type.

Examples

-- Create a table and insert sample data
CREATE TABLE hits (
user_id INT,
request_num INT
);

INSERT INTO hits (user_id, request_num)
VALUES (1, 10),
(2, 15),
(3, 20),
(1, 13),
(2, 21),
(3, 25),
(1, 30),
(2, 41),
(3, 45);

SELECT user_id, GROUP_ARRAY_MOVING_AVG(2)(request_num) AS avg_request_num
FROM hits
GROUP BY user_id;

| user_id | avg_request_num |
|---------|------------------|
| 1 | [5.0,11.5,21.5] |
| 3 | [10.0,22.5,35.0] |
| 2 | [7.5,18.0,31.0] |
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