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https://issues.apache.org/jira/browse/PIG-2378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13611989#comment-13611989
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Johnny Zhang commented on PIG-2378:
-----------------------------------
I think it is not a bug, using
{noformat}
B = MY_MACRO(A, 'header.time');
{noformat}
should just make it work.
I try it in pig 0.11 release by below test:
1. macro.pig
{noformat}
a = load '/var/lib/jenkins/macro' as (f1:int, f2:int, f3:int);
dump a;
b = foreach a generate f1, (f2, f3) as f5;
dump b;
describe b;
define macro1 (c, d) returns e {
$e = group $c by $d;
}
e = macro1 (b, 'f5.f2');
dump e;
{noformat}
2. data macro
{noformat}
1 2 3
4 5 6
7 8 9
{noformat}
3. run the test by 'pig -x local macro.pig' gets result
{noformat}
(2,{(1,(2,3))})
(5,{(4,(5,6))})
(8,{(7,(8,9))})
{noformat}
[~jadler], could you please verify whether it works for you? Thanks.
> 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
>
> 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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