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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-7400) count and count distinct not correct
Date Tue, 15 Jul 2014 05:14:04 GMT

    [ https://issues.apache.org/jira/browse/HIVE-7400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14061672#comment-14061672
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Gopal V commented on HIVE-7400:
-------------------------------

[~darranl]: I am using hive-14 which is the only branch in development at the moment.

And Tez is the new faster execution engine for Hive on Hadoop-2 clusters - http://www.slideshare.net/t3rmin4t0r/hivetez-a-performance-deep-dive/3

> 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
>         Attachments: data_150000
>
>
> I have a table in Hive and I want to count unique records and all records.
> Table looks like:
> {quote}       
> sid                     string                   
> sender                   string                                     
> domain                  string       
> product                 string
> {quote}
> And my query like this:
> {quote}
> select domain,product,count(1) as num,count(distinct sender)  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?
> ==================Updated==========================
> Dataset is uploaded. Row format delimited fields terminated by '\t'. This dataset has
150,000 rows. With this query, I got the result as followed:
> bq.domain1 product1        36424   36424



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