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> 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