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Pig, mail # user - Strange behaviour when using FLATTEN


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Re: Strange behaviour when using FLATTEN
pablomar 2012-04-11, 13:55
this is a very good explanation of flatten:

http://ofps.oreilly.com/titles/9781449302641/advanced_pig_latin.html#foreach_flatten

On Wed, Apr 11, 2012 at 9:46 AM, James Newhaven <[EMAIL PROTECTED]>wrote:

> Hi,
>
> Sorry, this is a PIG newbie question...
>
> When I use FLATTEN, I don't understand the structure of the relation that
> is returned.
>
> For example, the following relation A is the result of using flatten:
>
> DESCRIBE A;
>
> A {null::group: chararray,null::tagcount: long}
>
> I'm not really sure why there is "null" prefixing group and tagcount. Can
> anyone help explain what this means?
>
> Thanks,
> James
>