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From "Danran Lai (JIRA)" <>
Subject [jira] [Created] (HIVE-7400) count and count distinct not correct
Date Mon, 14 Jul 2014 09:44:04 GMT
Danran Lai created HIVE-7400:

             Summary: count and count distinct not correct
                 Key: HIVE-7400
             Project: Hive
          Issue Type: Bug
          Components: Query Processor
    Affects Versions: 0.11.0
            Reporter: Danran Lai

I have a table in Hive and I want to count unique records and all records.
Table looks like:
sid                     string                   
param                   map<string,string>                                     
domain                  string       
product                 string
And my query like this:
select domain,product,count(1) as num,count(distinct param['from'])  as user_num
from table
group by domain,product
But the results are not correct. I can get the right user_num, but the num is wrong which
is less than the real num. The real num is about 30 millon but I can only get 9 millon. 
So how can I fix this so that I get the correct result?

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