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https://issues.apache.org/jira/browse/PIG-2526?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13205856#comment-13205856
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Thejas M Nair commented on PIG-2526:
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I think this feature is worthwhile, I don't see a reason to limit map keys to
just constants. This will also be easy to implement.
> Add ability to parametize keys in maps with tuple fields or scalars
> -------------------------------------------------------------------
>
> Key: PIG-2526
> URL: https://issues.apache.org/jira/browse/PIG-2526
> Project: Pig
> Issue Type: New Feature
> Components: data, parser
> Affects Versions: 0.9.2
> Reporter: Russell Jurney
> Labels: data, happy, map, parameter, parametize, pig, type
>
> I want to access values in maps by tuple fields.
> A = load 'data' as (id:int, M:map[]);
> B = load 'other_data' as (id:int, cat:chararray);
> C = JOIN A by id, C by id;
> D = foreach A generate A:id, M#cat as hash_value; /* the value in cat for
> each record serves as the key in the map to retrieve its value. */
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