hello,

I want to know the principle of hiveql requests i.e how it translates these
queries into MapReduce job. Is there any  piece of source code that can
explain that.
thank you very much for your responses

For sample you can just do a explain exteneded (query) ..which does show
how your query is coverted to mapreduce

You can always checkout codebase from svn
On Nov 20, 2012 2:15 PM, "imen Megdiche" <[EMAIL PROTECTED]> wrote:

> hello,
>
> I want to know the principle of hiveql requests i.e how it translates
> these queries into MapReduce job. Is there any  piece of source code that
> can explain that.
> thank you very much for your responses
>

To some extent this,

https://cwiki.apache.org/confluence/display/Hive/DeveloperGuide#DeveloperGuide-QueryProcessor

In source look at ql/plan , ql/exec packages !

On Tue, Nov 20, 2012 at 2:19 PM, Nitin Pawar <[EMAIL PROTECTED]>wrote:

> For sample you can just do a explain exteneded (query) ..which does show
> how your query is coverted to mapreduce
>
> You can always checkout codebase from svn
> On Nov 20, 2012 2:15 PM, "imen Megdiche" <[EMAIL PROTECTED]> wrote:
>
>> hello,
>>
>> I want to know the principle of hiveql requests i.e how it translates
>> these queries into MapReduce job. Is there any  piece of source code that
>> can explain that.
>> thank you very much for your responses
>>
>
--
Regards,
Bharath .V
w:http://researchweb.iiit.ac.in/~bharath.v

The following papers provide an overview of Hive. These papers also explain
the query rewrite i.e., translation from HiveQL to MR.

http://www.vldb.org/pvldb/2/vldb09-938.pdf
http://i.stanford.edu/~ragho/hive-icde2010.pdf

If you want to look at the code, you should probably start with
SemanticAnalyzer.java.  genPlan() and genMapRedTasks() in
SemanticAnalyzer.java are good starting points for looking at plan
generation.

Thanks.
Shreepadma.

On Tue, Nov 20, 2012 at 2:30 AM, bharath vissapragada <
[EMAIL PROTECTED]> wrote:

> To some extent this,
>
>
> https://cwiki.apache.org/confluence/display/Hive/DeveloperGuide#DeveloperGuide-QueryProcessor
>
> In source look at ql/plan , ql/exec packages !
>
> On Tue, Nov 20, 2012 at 2:19 PM, Nitin Pawar <[EMAIL PROTECTED]>wrote:
>
>> For sample you can just do a explain exteneded (query) ..which does show
>> how your query is coverted to mapreduce
>>
>> You can always checkout codebase from svn
>> On Nov 20, 2012 2:15 PM, "imen Megdiche" <[EMAIL PROTECTED]> wrote:
>>
>>> hello,
>>>
>>> I want to know the principle of hiveql requests i.e how it translates
>>> these queries into MapReduce job. Is there any  piece of source code that
>>> can explain that.
>>> thank you very much for your responses
>>>
>>
>
>
> --
> Regards,
> Bharath .V
> w:http://researchweb.iiit.ac.in/~bharath.v
>