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https://issues.apache.org/jira/browse/PIG-2600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13235048#comment-13235048
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Prashant Kommireddi commented on PIG-2600:
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I don't see a clear advantage of using Tuples over Bags in this case, I guess I
can change it to be Bags. One of the use-cases could be to find Set
Intersections or Unions between the value sets or lists. For example, each Map
could be an array of (User, PageId) entries, and one might want to find
intersections between different click-through patterns. I don't use too much of
Maps in my PigLatin code to be honest so others can pitch in on how they would
like this to be used.
Regarding INVERSEMAP, the return type now would be Map<String, DataBag> now. We
will be returning a bag of keys a value maps to?
> Better Map support
> ------------------
>
> Key: PIG-2600
> URL: https://issues.apache.org/jira/browse/PIG-2600
> Project: Pig
> Issue Type: Improvement
> Reporter: Jonathan Coveney
> Assignee: Prashant Kommireddi
> 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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