array_cum_sum

SinceVersion 2.0

array_cum_sum

description

返回数组的累计和。数组中的NULL值会被跳过，并在结果数组的相同位置设置NULL。

Syntax

Array<T> array_cum_sum(Array<T>)

notice

仅支持向量化引擎中使用

example

mysql> create table array_type_table(k1 INT, k2 Array<int>) duplicate key (k1) distributed by hash(k1) buckets 1 properties('replication_num' = '1');
mysql> insert into array_type_table values (0, []), (1, [NULL]), (2, [1, 2, 3, 4]), (3, [1, NULL, 3, NULL, 5]);
mysql> set enable_vectorized_engine = true;    # enable vectorized engine
mysql> select k2, array_cum_sum(k2) from array_type_table;
+-----------------------+-----------------------+
| k2                    | array_cum_sum(`k2`)   |
+-----------------------+-----------------------+
| []                    | []                    |
| [NULL]                | [NULL]                |
| [1, 2, 3, 4]          | [1, 3, 6, 10]         |
| [1, NULL, 3, NULL, 5] | [1, NULL, 4, NULL, 9] |
+-----------------------+-----------------------+
4 rows in set
Time: 0.122s

keywords

ARRAY,CUM_SUM,ARRAY_CUM_SUM