array_avg

Name

array_avg

Description

This function returns the average of all elements in an array (NULL values are skipped). If the array is empty or all elements in the array are NULL values, the function returns NULL.

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]), (3, [1, NULL, 3]);
mysql> set enable_vectorized_engine = true;    # enable vectorized engine
mysql> select k2, array_avg(k2) from array_type_table;
+--------------+-----------------+
| k2           | array_avg(`k2`) |
+--------------+-----------------+
| []           |            NULL |
| [NULL]       |            NULL |
| [1, 2, 3]    |               2 |
| [1, NULL, 3] |               2 |
+--------------+-----------------+
4 rows in set (0.01 sec)

Keywords

ARRAY,AVG,ARRAY_AVG

VARIANCE,VAR_POP,VARIANCE_POP array_contains