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From "Prashant Kommireddi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIG-2600) Better Map support
Date Mon, 22 Oct 2012 19:34:13 GMT

    [ https://issues.apache.org/jira/browse/PIG-2600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13481704#comment-13481704
] 

Prashant Kommireddi commented on PIG-2600:
------------------------------------------

Btw, syntax and usage examples are all present in java files for each of the UDFs. Lmk if
it needs to go into release notes (and where) and I can put it there.
                
> 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_2.patch, PIG-2600_3.patch, PIG-2600_4.patch, PIG-2600_5.patch,
PIG-2600_6.patch, PIG-2600_7.patch, PIG-2600_8.patch, PIG-2600_9.patch, PIG-2600.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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