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From "Bill Graham (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIG-2600) Better Map support
Date Fri, 16 Mar 2012 15:15:40 GMT

    [ https://issues.apache.org/jira/browse/PIG-2600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13231282#comment-13231282
] 

Bill Graham commented on PIG-2600:
----------------------------------

+1 for overloading. People often try to use these with Maps or Bags, realize they can't and
then write a MapToBag UDF.

Do you think INVERSEMAP is something that people need often? I question the general usefulness
of that one.
                
> 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
>
>
> 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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