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https://issues.apache.org/jira/browse/PIG-2600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13233850#comment-13233850
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Jonathan Coveney commented on PIG-2600:
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Prashant,
Thanks for working on this! As far as Inversemap, I don't know if I like the
semantic that if there are multiple values, you just get essentially a random
Key. I think you should get a Tuple or Bag of or List whatever of Keys that
correspond... the assumption is that values can appear more than once.
Open to debate though :)
Another option on the "inversmap only works on Map<String,String>" front would
be that, if given Map<String, T>" it converts T to a string, which I think
isn't a bad idea. Maybe that could be a constructor option, and the default is
an error.
> 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
>
>
> 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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