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From "Owen O'Malley" <omal...@apache.org>
Subject Re: Optimizing hive queries
Date Fri, 29 Mar 2013 05:48:05 GMT
Actually, Hive already has the ability to have different schemas for
different partitions. (Although of course it would be nice to have the
alter table be more flexible!)

The "versioned metadata" means that the ORC file's metadata is stored in
ProtoBufs so that we can add (or remove) fields to the metadata. That means
that for some changes to ORC file format we can provide both forward and
backward compatibility.

-- Owen


On Thu, Mar 28, 2013 at 10:25 PM, Jagat Singh <jagatsingh@gmail.com> wrote:

> Hello Nitin,
>
> Thanks for sharing.
>
> Do we have more details on
>
> Versioned metadata feature of ORC ? , is it like handling varying schemas
> in Hive?
>
> Regards,
>
> Jagat Singh
>
>
>
> On Fri, Mar 29, 2013 at 4:16 PM, Nitin Pawar <nitinpawar432@gmail.com>wrote:
>
>>
>> Hi,
>>
>> Here is is a nice presentation from Owen from Hortonworks on "Optimizing
>> hive queries"
>>
>> http://www.slideshare.net/oom65/optimize-hivequeriespptx
>>
>>
>>
>> Thanks,
>> Nitin Pawar
>>
>
>

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