0.hive官方函數解釋
hive官網函數大全地址:HIVE官網函數大全地址
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數據展示,手動生成map類型數據
select
str_to_map(concat(path_id,':',filter_name )) ---是map類型的
from FDM_SOR.T_FIBA_MULTI_UBA_CFG_PATH_DETAIL_D
group by path_id,filter_Name
1.2函數測試
select
size(m), --求map的長度
map_keys(m), --將map中對應的所有keys.存儲格式爲array
map_values(m), --將map中對應的所有values
sort_array(map_keys(m)), --對map的keys進行排序
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類型的
from FDM_SOR.T_FIBA_MULTI_UBA_CFG_PATH_DETAIL_D
group by path_id,filter_Name ) a