HMGET
Syntax
        HMGET key field [field ...]
- Available since:
 - 2.0.0
 - Time complexity:
 - O(N) where N is the number of fields being requested.
 - ACL categories:
 - 
              
                
@read,@hash,@fast, 
Returns the values associated with the specified fields in the hash stored at
key.
For every field that does not exist in the hash, a nil value is returned.
Because non-existing keys are treated as empty hashes, running HMGET against
a non-existing key will return a list of nil values.