hive-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Stephen Sprague <sprag...@gmail.com>
Subject Re: Tablesample doubling
Date Tue, 30 Jul 2013 02:39:36 GMT
+1 for documentation.  sometimes it surprises you. :)


On Mon, Jul 29, 2013 at 7:11 PM, j.barrett Strausser <
j.barrett.strausser@gmail.com> wrote:

> Nevermind I see in the docs, it is rows PER SPLIT.
>
> -b
>
>
> On Mon, Jul 29, 2013 at 9:52 PM, j.barrett Strausser <
> j.barrett.strausser@gmail.com> wrote:
>
>> SELECT COUNT(*) FROM sparse_features_small;
>>
>> And I receive back :
>>
>> Total MapReduce CPU Time Spent: 3 seconds 330 msec
>> OK
>> 100000
>>
>> Rather than the expected 50000
>>
>> I am running hive 11.2
>>
>>
>>
>>
>> On Mon, Jul 29, 2013 at 9:51 PM, j.barrett Strausser <
>> j.barrett.strausser@gmail.com> wrote:
>>
>>> Hello All,
>>>
>>> Why does TABLESAMPLE(N rows) produce ouptut with 2*N rows?
>>>
>>>
>>> I have the following script:
>>>
>>> DROP TABLE IF EXISTS sparse_features_small;
>>>
>>> CREATE TABLE sparse_features_small ROW FORMAT DELIMITED FIELDS
>>> TERMINATED BY ',' LINES TERMINATED BY '\n' as
>>>
>>> SELECT
>>>         *
>>> FROM
>>>         sparse_features
>>> TABLESAMPLE(50000 ROWS)
>>>
>>>
>>> After I execute this by sourcing the file, I can then execute :
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> --
>>>
>>>
>>> https://github.com/bearrito
>>> @deepbearrito
>>>
>>
>>
>>
>> --
>>
>>
>> https://github.com/bearrito
>> @deepbearrito
>>
>
>
>
> --
>
>
> https://github.com/bearrito
> @deepbearrito
>

Mime
View raw message