EXPLODE_NUMBERS_OUTER

Description

The explode_numbers_outer function accepts an integer and maps each number in the range to a separate row. It should be used together with LATERAL VIEW to flatten nested data structures into a standard flat table format. The main difference between explode_numbers_outer and explode_numbers is how they handle null values.

Syntax

EXPLODE_NUMBERS_OUTER(<int>)

Parameters

• <int> Integer type

Return Value

• Returns an integer column [0, n), with column type Nullable<INT>.
• If <int> is NULL, 0, or negative, 1 row with NULL is returned.

Examples

1. Regular parameters
   select  * from (select 1 as k1) t1 lateral view explode_numbers_outer(10) t2 as c;

   +------+------+
   | k1   | c    |
   +------+------+
   |    1 |    0 |
   |    1 |    1 |
   |    1 |    2 |
   |    1 |    3 |
   |    1 |    4 |
   |    1 |    5 |
   |    1 |    6 |
   |    1 |    7 |
   |    1 |    8 |
   |    1 |    9 |
   +------+------+

2. Parameter 0
   select  * from (select 1 as k1) t1 lateral view explode_numbers_outer(0) t2 as c;

   +------+------+
   | k1   | c    |
   +------+------+
   |    1 | NULL |
   +------+------+

3. NULL parameter
   select  * from (select 1 as k1) t1 lateral view explode_numbers_outer(NULL) t2 as c;

   +------+------+
   | k1   | c    |
   +------+------+
   |    1 | NULL |
   +------+------+

4. Negative parameter
   select  * from (select 1 as k1) t1 lateral view explode_numbers_outer(-1) t2 as c;

   +------+------+
   | k1   | c    |
   +------+------+
   |    1 | NULL |
   +------+------+