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https://issues.apache.org/jira/browse/PIG-2600?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Prashant Kommireddi updated PIG-2600:
-------------------------------------
Attachment: PIG-2600_3.patch
Attaching a revised patch. Here is the new functionality of INVERSEMAP, you
would find the documentation in Class docs
{code}
grunt> cat 1data
[open#1,1#2,11#2]
[apache#2,3#4,12#24]
grunt> a = load 'data' as (M:[int]);
grunt> b = foreach a generate INVERSEMAP($0);
grunt> dump b;
([2#(1,11),1#(open)])
([2#(apache),24#(12),4#(3)])
{code}
> Better Map support
> ------------------
>
> Key: PIG-2600
> URL: https://issues.apache.org/jira/browse/PIG-2600
> Project: Pig
> Issue Type: Improvement
> Reporter: Jonathan Coveney
> Fix For: 0.11
>
> Attachments: PIG-2600.patch, PIG-2600_2.patch, PIG-2600_3.patch
>
>
> It would be nice if Pig played better with Maps. To that end, I'd like to add
> a lot of utility around Maps.
> - TOBAG should take a Map and output {(key, value)}
> - TOMAP should take a Bag in that same form and make a map.
> - KEYSET should return the set of keys.
> - VALUESET should return the set of values.
> - VALUELIST should return the List of values (no deduping).
> - INVERSEMAP would return a Map of values => the set of keys that refer to
> that Key
> This would all be pretty easy. A more substantial piece of work would be to
> make Pig support non-String keys (this is especially an issue since UDFs and
> whatnot probably assume that they are all Integers). Not sure if it is worth
> it.
> I'd love to hear other things that would be useful for people!
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