EXPLODE_NUMBERS

Description

The explode_numbers 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 and explode_numbers_outer is how they handle null values.

Syntax

EXPLODE_NUMBERS(<int>)

Parameters

• <int> Integer type

Return Value

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

Examples

0. Prepare data

   create table example(
       k1 int
   ) properties(
       "replication_num" = "1"
   );
   
   insert into example values(1);
1. Regular parameters

   select  * from example lateral view explode_numbers(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 example lateral view explode_numbers(0) t2 as c;

   Empty set (0.03 sec)
3. NULL parameter

   select  * from example lateral view explode_numbers(NULL) t2 as c;

   Empty set (0.03 sec)
4. Negative parameter

   select  * from example lateral view explode_numbers(-1) t2 as c;

   Empty set (0.04 sec)