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From "Connell, Chuck" <Chuck.Conn...@nuance.com>
Subject Any advice about complex Hive tables?
Date Mon, 08 Oct 2012 20:37:09 GMT
(Follow up to the thread below...)

I have a complex Hive table -- many fields, many nested structs. Hive fails to create the
table at all. I can't even start to load data or query the data. Anyone else run into this?
It seems to be a showstopper to using Hive for us, which is a shame since everything else
about Hive is just what we want.

Any suggestions? Workarounds?

Thanks,
Chuck


________________________________________
From: Connell, Chuck
Sent: Thursday, October 04, 2012 4:31 PM
To: user@hive.apache.org
Subject: RE: Limit to columns or nesting of Hive table?

The issue apparently is not just the number of levels of nesting. I just created a Hive table
with 20 levels of structs within each other. It created fine. This is more levels than the
table that was failing for me. The failing table had many more fields throughout the levels.

Chuck



-----Original Message-----
From: Connell, Chuck [mailto:Chuck.Connell@nuance.com]
Sent: Thursday, October 04, 2012 12:09 PM
To: user@hive.apache.org
Subject: RE: Limit to columns or nesting of Hive table?

Thanks. So is the nesting limit 10 now? Does your 2nd paragraph mean that this limit cannot
easily be raised?

Chuck

-----Original Message-----
From: Edward Capriolo [mailto:edlinuxguru@gmail.com]
Sent: Thursday, October 04, 2012 11:57 AM
To: user@hive.apache.org
Subject: Re: Limit to columns or nesting of Hive table?

There is an open jira ticket on this. There is a hard coded limit but it could be raised with
some mostly minor code changes.

One of the bigger problems is that hive stores the definition of a column in JDBC "column"
and for some databases larger nested structs can case issues.

Edward

On Thu, Oct 4, 2012 at 11:48 AM, Connell, Chuck <Chuck.Connell@nuance.com> wrote:
> I am trying to create a large Hive table, with many columns and deeply
> nested structs. It is failing with java.lang.ArrayIndexOutOfBoundsException:
> 10.
>
>
>
> Before I spend a lot of time debugging my table declaration, is there
> some limit here I should know about? Max number of columns? Max depth
> of struct nesting?
>
>
>
> Thanks,
>
> Chuck
>
>

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