EXPLODE

explode

description

Table functions must be used in conjunction with Lateral View.

explode array column to rows. explode_outer will return NULL, while array is NULL or empty. explode and explode_outer both keep the nested NULL elements of array.

syntax

explode(expr)
explode_outer(expr)

example

mysql> set enable_vectorized_engine = true

mysql> select e1 from (select 1 k1) as t lateral view explode([1,2,3]) tmp1 as e1;
+------+
| e1   |
+------+
|    1 |
|    2 |
|    3 |
+------+

mysql> select e1 from (select 1 k1) as t lateral view explode_outer(null) tmp1 as e1;
+------+
| e1   |
+------+
| NULL |
+------+

mysql> select e1 from (select 1 k1) as t lateral view explode([]) tmp1 as e1;
Empty set (0.010 sec)

mysql> select e1 from (select 1 k1) as t lateral view explode([null,1,null]) tmp1 as e1;
+------+
| e1   |
+------+
| NULL |
|    1 |
| NULL |
+------+

mysql> select e1 from (select 1 k1) as t lateral view explode_outer([null,1,null]) tmp1 as e1;
+------+
| e1   |
+------+
| NULL |
|    1 |
| NULL |
+------+

keywords

EXPLODE,EXPLODE_OUTER,ARRAY