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https://issues.apache.org/jira/browse/PIG-2600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13234499#comment-13234499
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Jonathan Coveney commented on PIG-2600:
---------------------------------------
Hey Prashant, thanks again for your work on this. Took a look at the patch,
looks good, though I'm wondering if VALUELIST and VALUESET shouldn't return
bags? I guess it depends how someone plans to use it and you could convert
easily from one to the other, but yeah... hmm. I think the big question is how
it'd be used. The awkward part about having it as a Tuple is that it'd be
impossible to do anything with the elements short of having a UDF to read them,
whereas if it's a bag, then we know the type of the keys (whatever it is in the
Map), and it seems more workable to me. This idea applies to all of the
methods, really.
> 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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