0.hive官方函数解释
hive官网函数大全地址：HIVE官网函数大全地址
Collection Functions
| Return Type | Name(Signature) | Description |
|---|---|---|
| int | size(Map<K.V>) | Returns the number of elements in the map type. |
| int | size(Array<T>) | Returns the number of elements in the array type. |
| boolean | array_contains(Array<T>, value) | Returns TRUE if the array contains value. |
| array<V> | map_values(Map<K.V>) | Returns an unordered array containing the values of the input map. |
| array<t> | sort_array(Array<T>) | Sorts the input array in ascending order according to the natural ordering of the array elements and returns it (as of version 0.9.0). |
| array<K> | map_keys(Map<K.V>) | Returns an unordered array containing the keys of the input map. |
1.使用演示
1.1数据展示，手动生成map类型数据
select
str_to_map(concat(path_id,':',filter_name )) ---是map类型的
from FDM_SOR.T_FIBA_MULTI_UBA_CFG_PATH_DETAIL_D
group by path_id,filter_Name
1.2函数测试
select
size(m), --求map的长度
map_keys(m), --将map中对应的所有keys.存储格式为array
map_values(m), --将map中对应的所有values
sort_array(map_keys(m)), --对map的keys进行排序
array_contains(map_keys(m),'162') ---map的keys中是否包含162
from ( select
str_to_map(concat(path_id,':',filter_name )) m ---是map类型的
from FDM_SOR.T_FIBA_MULTI_UBA_CFG_PATH_DETAIL_D
group by path_id,filter_Name ) a
