Hi，does doris support the accumulate function which likes the 'runningAccumulate' function in clickhouse? And this function should support dau metric, like count(distinct)

[neytao]

does doris support the accumulate function which likes the 'runningAccumulate' function in clickhouse? And this function should support dau metric, like count(distinct)

https://clickhouse.com/docs/en/sql-reference/functions/other-functions#runningaccumulate

[yagagagaga]

It looks very like some window function, for example:
Here is the SQL for ClickHouse below:

SELECT
    grouping,
    item,
    runningAccumulate(state, grouping) AS res
FROM
(
    SELECT
        toInt8(number / 4) AS grouping,
        number AS item,
        sumState(number) AS state
    FROM numbers(15)
    GROUP BY item
    ORDER BY item ASC
);

┌─grouping─┬─item─┬─res─┐
│        0 │    0 │   0 │
│        0 │    1 │   1 │
│        0 │    2 │   3 │
│        0 │    3 │   6 │
│        1 │    4 │   4 │
│        1 │    5 │   9 │
│        1 │    6 │  15 │
│        1 │    7 │  22 │
│        2 │    8 │   8 │
│        2 │    9 │  17 │
│        2 │   10 │  27 │
│        2 │   11 │  38 │
│        3 │   12 │  12 │
│        3 │   13 │  25 │
│        3 │   14 │  39 │
└──────────┴──────┴─────┘

Here is the SQL for Doris below:

SELECT
    grouping,
    item,
    sum(state) over(partition by grouping order by item rows between unbounded preceding and current row) AS res
FROM (
    SELECT
        cast(number / 4 as int) AS grouping,
        number AS item,
        sum(number) AS state
    FROM numbers('number'='15')
    GROUP BY item
    ORDER BY item ASC
) t;

+----------+------+------+
| grouping | item | res  |
+----------+------+------+
|        0 |    0 |    0 |
|        0 |    1 |    1 |
|        0 |    2 |    3 |
|        0 |    3 |    6 |
|        1 |    4 |    4 |
|        1 |    5 |    9 |
|        1 |    6 |   15 |
|        1 |    7 |   22 |
|        2 |    8 |    8 |
|        2 |    9 |   17 |
|        2 |   10 |   27 |
|        2 |   11 |   38 |
|        3 |   12 |   12 |
|        3 |   13 |   25 |
|        3 |   14 |   39 |
+----------+------+------+