hive: cast array<struct<key:string,value:array<string>>> into map<string,array<string>>

问题

I have a hive table like

name            string                                      
address         string                                      
timezone        string                                      
one_key_value   array<struct<key:string,value:array<string>>                    
two_key_value   array<struct<key:string,value:array<string>>

and want to convert it to

name            string                                      
address         string                                      
timezone        string                                      
one_key_value   map<string,array<string>>                       
two_key_value   map<string,array<string>>

There is explode(array) but doesn't really return the entire table in the format I want.

回答1:

Use lateral view with inline and map the resulting keys and values.

select name,address,timezone,map(k1,v1),map(k2,v2)
from tbl 
lateral view inline(one_key_value) t1 as k1,v1
lateral view inline(two_key_value) t1 as k2,v2

来源：https://stackoverflow.com/questions/52863171/hive-cast-arraystructkeystring-valuearraystring-into-mapstring-arrays