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https://issues.apache.org/jira/browse/PIG-2378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13662002#comment-13662002
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Xuefu Zhang commented on PIG-2378:
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The fix might not be at the grammar but at functionality extension. It might
make sense to support free-text as parameters to be passed to macro.
> macros don't accept references to items within tuples as arguments
> ------------------------------------------------------------------
>
> Key: PIG-2378
> URL: https://issues.apache.org/jira/browse/PIG-2378
> Project: Pig
> Issue Type: Improvement
> Affects Versions: 0.9.1
> Reporter: Joseph Adler
> Assignee: Johnny Zhang
> Attachments: PIG-2378.patch.txt, PIG-2378.patch.txt
>
>
> I'd like to be able to pass a reference to an item within a parameter to a
> Pig Macro.
> For example, suppose that I had a relation A with the schema A:{id:long,
> header:(time:long, type:chararray)}. I'd like to call a macro by typing:
> B = MY_MACRO(A, header.time);
> but this does not currently work. Obviously, I could define a new relation as
> a workaround, for example I could use some pig code like
> AA = FOREACH a GENERATE *, header.time as time;
> B = MY_MACRO(AA, time);
> But that's ugly and clunky
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