How to extract the keys of a map ?

[Vincent Barat <vi...@gmail.com>]

Hi !

I've a bag of map...

([k3#v13,k1#v11,k2#v12])
([k1#v12,k2#v22])
([k4#v31])

... and would like to extract all key names:

(k3)
(k1)
(k2)
(k1)
(k2)
(k4)

I cannot figure out how to do this (except by writting an UDF).

Any idea ?

Thanks a lot

Re: How to extract the keys of a map ?

[Vincent Barat <vb...@capptain.com>]

Thank you Bill, that should do the work :-)

Le 29/06/12 18:16, Bill Graham a écrit :
> There's support for this in the trunk FYI:
> https://issues.apache.org/jira/browse/PIG-2600
>
> On Fri, Jun 29, 2012 at 5:05 AM, Vincent Barat <vi...@gmail.com>wrote:
>
>> Hi !
>>
>> I've a bag of map...
>>
>> ([k3#v13,k1#v11,k2#v12])
>> ([k1#v12,k2#v22])
>> ([k4#v31])
>>
>> ... and would like to extract all key names:
>>
>> (k3)
>> (k1)
>> (k2)
>> (k1)
>> (k2)
>> (k4)
>>
>> I cannot figure out how to do this (except by writting an UDF).
>>
>> Any idea ?
>>
>> Thanks a lot
>>
>
>

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Re: How to extract the keys of a map ?

[Bill Graham <bi...@gmail.com>]

There's support for this in the trunk FYI:
https://issues.apache.org/jira/browse/PIG-2600

On Fri, Jun 29, 2012 at 5:05 AM, Vincent Barat <vi...@gmail.com>wrote:

> Hi !
>
> I've a bag of map...
>
> ([k3#v13,k1#v11,k2#v12])
> ([k1#v12,k2#v22])
> ([k4#v31])
>
> ... and would like to extract all key names:
>
> (k3)
> (k1)
> (k2)
> (k1)
> (k2)
> (k4)
>
> I cannot figure out how to do this (except by writting an UDF).
>
> Any idea ?
>
> Thanks a lot
>



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