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Hive, mail # user - Execution of udf


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Re: Execution of udf
Dean Wampler 2013-01-18, 14:54
There is no reduce phase needed in this query.

On Fri, Jan 18, 2013 at 6:59 AM, nagarjuna kanamarlapudi <
[EMAIL PROTECTED]> wrote:

> Hi,
>
> Select col1,myudf(col2,col3) from table1;
>
>
> In what phase if map reduce an udf is executed.
>
> In the very beginning, I assumed that hive will be joining two tables.,
> getting the required columns and then applies udf on columns specified
> I.e., essentially on reducer phase . But later on I realised that I was
> wrong.
>
> Is there any specific parameter which suggests hive to call udf at reducer
> phase rather than at Mapper phase.
>
>
> Regards,
> Nagarjuna
>
>
> --
> Sent from iPhone
>

--
*Dean Wampler, Ph.D.*
thinkbiganalytics.com
+1-312-339-1330