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From Alan Gates <ga...@hortonworks.com>
Subject Re: largest table last in joins
Date Mon, 05 May 2014 15:49:52 GMT
Join ordering is not yet part of the Hive optimizer.  There is integration work being done
with the Optiq framework that will address this, but it is not complete yet.  Hopefully at
least an initial integration will be available in the next Hive release.

Alan.

On May 2, 2014, at 5:36 AM, Aleksei Udatšnõi <a.udachny@gmail.com> wrote:

> Hello,
> 
> There is this old recommendation for optimizing Hive join to use the largest table last
in the join.
> http://archive.cloudera.com/cdh/3/hive/language_manual/joins.html
> 
> The same recommendation appears in Programming Hive book.
> 
> Is this recommendation still valid or newer version of Hive take care of such optimization
automatically?
> 
> Best,
> Aleksei
> 


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