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Date: Mon, 14 Jul 2014 09:44:04 +0000 (UTC)
From: "Danran Lai (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Message-ID: <JIRA.12727057.1405330938302.34676.1405331044294@arcas>
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References: <JIRA.12727057.1405330938302@arcas>
Subject: [jira] [Created] (HIVE-7400) count and count distinct not correct
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Danran Lai created HIVE-7400:
--------------------------------

             Summary: count and count distinct not correct
                 Key: HIVE-7400
                 URL: https://issues.apache.org/jira/browse/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:
{quote}       
sid                     string                   
param                   map<string,string>                                     
domain                  string       
product                 string
{quote}
And my query like this:
{quote}
select domain,product,count(1) as num,count(distinct param['from'])  as user_num
from table
group by domain,product
{quote}
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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