KVGEN - cann't select the drill on hbase with json value

[kvnew]

Hi, 


About drill on hbase,  when i search the result of kvgen ,but cann't match the 
value on hbase. 


select KVGEN(CONVERT_FROM(united_user_profile_test1.f4.province_freq, 'UTF8')) 
from hbase.united_user_profile_test1 limit 10 


It take out error: 
"

Query Failed: An Error Occurred
org.apache.drill.common.exceptions.UserRemoteException: SYSTEM ERROR: 
DrillRuntimeException: kvgen function only supports Simple maps as input 
Fragment 0:0 [Error Id: 91b98616-de1c-49bf-bbbc-3d39e8b57a5a on 
tencent-recom-hdp04:31010]"




Hbase:
 00026b888c2eef20bad9de column=f4:province_freq, timestamp=1537861268399, 
value={"\xE5\xB9
         \xBF\xE4\xB8\x9C":1}





Thanks,
liuwenkai


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