大数据学习（二十五）hive中的space函数

1.空格字符串函数：space

语法：space（int n)

返回值:string

说明：返回长度为n的空格字符串

举例：

hive> select space(10) from dual;
hive> select length(space(10)) from dual;
10

2.space函数与split函数结合，得到数组

space函数与split函数结合，可以得到空格字符串数组

hive>select split(space(10), '');
[" "," "," "," "," "," "," "," "," "," ",""]

3.可以通过space函数和split函数，得到连续数字

select 
    start+a_id as number_1_100
from
(
select
    1 as start 
from dual
lateral view posexplode(split(space(100),'') tmp_a as a_id,a_index -- a_id为posexplode产生的序号，从0开始
)